Tip #26: Let it go.

You can wordsmith a draft right up until the deadline, but sometimes you have to let it go early to get constructive feedback from an objective reviewer -- be it your editor, a trusted colleague or the client.

This is especially true with writing assignments for first-time clients, whose expectations may have been made clear in the contract but are, in fact, untested. You won't know if you got it right until you ask. So let your (polished) draft go into review.