How do I improve my rewriting and editing skills? When writing academic papers, I am really bad at improving what I have already written. I have heard that most of the time writing should be allotted to revisions. I know a few academics who are really good at keeping on revising until they are happy, but I simply can't do it. Knowing that a sentence/paragraph/section can be improved but not being able to do so is very frustrating.

My partial self-diagnosis:


I refuse to make big changes, probably since it is a lot of work. (This sounds like I'm just procrastinating.)
If write with collaborators (almost always), I do not want to change what they wrote or revised, unless it is obviously wrong. (This sounds like I lack confidence in my writing skills. Or I just don't want to upset my coauthors?)
Before rewriting, I can't even re-read properly. I don't want to re-read the paper carefully and create a current copy of it in my head. I tend to skip parts. Even after I have re-read the manuscript, it is not always clear what the current state of the paper is.


I am sure I have many weaknesses that I am failing to verbalize in this question, but I'd like to hear what others did to train their rewriting skills. Also, I want to hear how you rewrite.

FYI, I am not a native speaker of English but I have seriously written only in English. My field is science and engineering.
I recently posted a lengthy answer for a similar question a few days ago, the essence of which was to separate what you're going to say from how you're going to say it.

If you've done this for a paper, you can edit it focussing on writing style alone. This is a good way of avoiding the "big changes" you mentioned in your question: You will have made all these before actually formulating the text.  As a consequence, you should also know precisely what it is you are trying to say in each paragraph.

Iteratively refining a text can get you stuck in dead ends, e.g. if you choose a certain formulation and then can't make it sound right. One thing I often do when I get suck with a paragraph or chunk of text that I don't know how to fix, is to just delete it and rewrite it. 

If you get stuck on the specific formulations themselves, i.e. you don't know how to re-write a certain paragraph, you could try explaining it (remember that you know what you want to say, but not how to say it) out loud to an imaginary listener.

Reading a paragraph out loud is a good way of forcing yourself to re-read it. It's also a great way of checking if something sounds silly or is not really comprehensible.

Update

If you're having trouble reading to yourself, you may want to try pairing-up with a colleague or co-author, and reading parts of the paper to each other. Granted, this may feel a bit awkward, but just look at it as editing the paper together. Working in pairs is known to improve motivation and productivity, and will basically force you to concentrate on the task at hand.

If you have problems concentrating in general, I can give you a few tips from my own experience:


Break down your editing into short bursts of at most an hour, and focus only on a part of the paper, e.g. the abstract, a figure, or any specific section.
The first few hours in the morning are the most productive for me. Try to find out where your own "best time" is.
Coffee. In certain cases, the caffeine can help you focus.