Here in the West, we should want for nothing.
Most of us have ample food, housing, clothing and means of transportation, but it is somehow never enough. We spend our days thinking about what we "need" in order to make our lives better, more livable. If I only had _______ then my life would be better. You can insert material possessions, emotions, knowledge, a better yoga practice; there's always something.
In action, Aparigraha gives us the opportunity to work on "letting go" while simultaneously trying to squelch the fires of desire. As in the previous four yamas, a fantastic place to start is with the self.
Take a little inventory and note your desires. Not your life goals, but the things which you covet. Good examples are power, a better body, money, a stronger yoga practice, people, etc.
And then a good practice is to notice how much of the time your mind is consumed by thoughts of these possessions or attachments. How much of your time is spent desiring a different life than the one that you have or clinging to the life that you "have"?
Desire is often rooted in fear. Attachment is also rooted in fear.
We are often attached to notions that we have of ourselves. The ego (ahamkara) is strong and loud. It takes lifetimes of practice to quiet its yearnings. Now is as good a time as any to begin.
On the mat, notice your tendency to cling to one style, one teacher, or even your ability to do a pose. Take a note of these attachments and try to use aparigraha to let go.
With each contemplation, note your reaction. Can you begin to ease your grip on these things?
The ultimate goal of a yoga practice is to let go of the false self and realize the true Self.
I have talked much about this in previous posts--about the 8-limbed path of Raja yoga and it's ultimate goal of Self-revelation. Aparigraha is just one step along the way, one which isn't going to be easy--attachment and desire are deep-seated--but one which we must take if we are to make it to the end.