Fighting Draft Dread: How do you make yourself start editing that book you wrote?

You finished a book. Getting all the way to The End, no matter how long it took or how good you think what you wrote is, is a major accomplishment. You need to take a moment, pat yourself on the back and bask in a job well done.

Except that, at some point, you've realized that was only the first battle of the long war to end up with a finished book. You're going to need to dive back into what you wrote to edit and polish it into something you can be proud to show around to...