user16806: I want to work on the Koan,'What was your original face before you were born' and 'Who am I',How do I go about it.
Should I constantly ask myself this question? Should I write it down?
How is the Koan practise done? 

user11074: "Hey, Newbie!  What was your original face before you were born?"
Choose ONE koan. Not two. Of the two you refer to, I recommend 'original face', unless you are spending a LOT of time with your teacher, as the second one will become a philosophical fiasco otherwise.
Don't rationalise. It's not a philosophical or intellectual exercise.
Ask yourself the question when you are not thinking about it.
Lots of Zen practitioners write it down. Paint it. Draw it, etc.
Does it help? Maybe.  Maybe not.
Don't talk about it. It's your practice. Don't talk about your practice except to your teacher. Maybe your students, one day.
Importantly, it's not a question about rebirth. You don't need to believe in rebirth in order to realise this koan.
Also, and paraphrasing @OyaMist's answer, also, there's nothing special about you either.  So when you perceive anything, you can ask yourself in that moment: "what was its original face before it was born?", whereas for @OyaMist, it's often "does it have the buddha nature?"
The main, core, essential process?  Just sit.
It's going to kill you. That's the point. But don't lose your life. If you are on the correct path, the path itself is an enriching and empowering experience. Hard work sometimes, painful sometimes.
I have heard of students kicking and screaming; having to be literally dragged to sanzen. Maybe ask yourself: Why is that? 

user19354: Maybe a koan is provided, maybe by The Teacher, when appropriate, and might be selected by The Teacher for the Student: there are a number of documented koan. Asking what to do with it/them, eg. is a start. Maybe some patience, and typically koan mightn't be suggested to someone right away etc. Describing koan with words is sort of counter to koan. Maybe consider it some, and develop quiet contemplation. Thats maybe more when addressing koan would be done more. Maybe aren't lots of specific schedules for it either in terms of months, years etc. Maybe write them down, or, they're brief enough, may be able to remember them. Attempting to consider koan at the outset & before some development of quiet contemplation may tend to result in less effectiveness.

user13709: Koans break the intellectual mind and require deeper investment.

SN41.6:1.4: “Householder, there are three processes. Physical, verbal, and mental processes.”

Practice a koan physically, verbally and mentally. For example, walk with it, speak it and feel it.
This sounds mysterious, but is actually practical. To walk with a koan, one might attend to "left foot original face", followed by "right foot original face". When meditating, one could silently speak the koan. To feel it one could look at anything that appears as "this tree original original face feels tall", "this car original face feels fast". And so forth. In other words, tie the koan into everything seamlessly. 
In this way one discovers "original face" and can answer the Roshi by presenting the original face. It takes much practice because most of us are distracted by other stuff day-to-day and moment-by-moment.
My koan was Joshu's Mu. Everything was Mu. Same practice, however.

16806: <p>I want to work on the Koan,<strong>'What was your original face before you were born'</strong> and '<strong>Who am I</strong>',How do I go about it.</p>

<p>Should I constantly ask myself this question? Should I write it down?</p>

<p>How is the Koan practise done? </p>
 11074: <p>"Hey, Newbie!  What was your original face before you were born?"</p>

<p>Choose ONE koan. Not two. Of the two you refer to, I recommend 'original face', unless you are spending a LOT of time with your teacher, as the second one will become a philosophical fiasco otherwise.</p>

<p>Don't rationalise. It's not a philosophical or intellectual exercise.
Ask yourself the question when you are not thinking about it.</p>

<p>Lots of Zen practitioners write it down. Paint it. Draw it, etc.
Does it help? Maybe.  Maybe not.</p>

<p>Don't talk about it. It's your practice. Don't talk about your practice except to your teacher. Maybe your students, one day.</p>

<p>Importantly, it's not a question about rebirth. You don't need to believe in rebirth in order to realise this koan.</p>

<p>Also, and paraphrasing @OyaMist's answer, also, there's nothing special about you either.  So when you perceive anything, you can ask yourself in that moment: "what was its original face before it was born?", whereas for @OyaMist, it's often "does it have the buddha nature?"</p>

<p>The main, core, essential process?  Just sit.</p>

<p>It's going to kill you. That's the point. But don't lose your life. If you are on the correct path, the path itself is an enriching and empowering experience. Hard work sometimes, painful sometimes.</p>

<p>I have heard of students kicking and screaming; having to be literally dragged to sanzen. Maybe ask yourself: Why is that? </p>
 19354: <p>Maybe a koan is provided, maybe by The Teacher, when appropriate, and might be selected by The Teacher for the Student: there are a number of documented koan. Asking what to do with it/them, eg. is a start. Maybe some patience, and typically koan mightn't be suggested to someone right away etc. Describing koan with words is sort of counter to koan. Maybe consider it some, and develop quiet contemplation. Thats maybe more when addressing koan would be done more. Maybe aren't lots of specific schedules for it either in terms of months, years etc. Maybe write them down, or, they're brief enough, may be able to remember them. Attempting to consider koan at the outset &amp; before some development of quiet contemplation may tend to result in less effectiveness.</p>
 13709: <p>Koans break the intellectual mind and require deeper investment.</p>

<blockquote>
  <p><a href="https://suttacentral.net/sn41.6/en/sujato#sn41.6:1.4" rel="nofollow noreferrer">SN41.6:1.4</a>: “Householder, there are three processes. Physical, verbal, and mental processes.”</p>
</blockquote>

<p>Practice a koan physically, verbally and mentally. For example, walk with it, speak it and feel it.</p>

<p>This sounds mysterious, but is actually practical. To walk with a koan, one might attend to "left foot original face", followed by "right foot original face". When meditating, one could silently speak the koan. To feel it one could look at anything that appears as "this tree original original face feels tall", "this car original face feels fast". And so forth. In other words, tie the koan into everything seamlessly. </p>

<p>In this way one discovers "original face" and can answer the Roshi by presenting the original face. It takes much practice because most of us are distracted by other stuff day-to-day and moment-by-moment.</p>

<p>My koan was Joshu's Mu. Everything was Mu. Same practice, however.</p>
