If you only ever use one trick to help you edit your writing, use this:
Read your work out loud.
Your ear will pick up odd phrasing and clumsy transitions far more easily than your eye will. It also forces you to look more closely at each word, allowing you to pick up on errors in spelling and punctuation that you might have missed during a rushed proofreading scan. Not to mention showing you very clearly where to place commas for clarity, i.e., spots where you pause naturally.
This trick works for complex, jargon-filled legal documents just as well as it does for casual emails. I guarantee, you won’t be disappointed by the results. (Though you might annoy your office animals. My cat always leaves in a huff once I reach this stage in my editing process.)
If you’re a translator, try using this trick for sentences in your source text that read as gibberish your first time through, too. If I had a nickel for every time this has helped me sort out the relationships between cloudy clauses, I could probably retire.
What is your best editing or revision trick? Have you tried this one yet? How did it work for you?