I've never seen a self-help book with this advice, but really it's some of the best advice I can give somebody going through a difficult stretch. Sometimes the absolute best you can do isn't that pretty, or elegant, or graceful, or frankly all that inspiring. When you're in one of those stretches, stop worrying about it. Nobody else could do that much better in your position either.
I found this post back in March and I still go back to it for advice and a soothing read in troubled waters. I recommend it to anyone currently struggling to swim.