The way I work, typically, I do everything at the very last minute. Even if I was given two months, I'd do it in the last three days.
You build on failure. You use it as a stepping stone. Close the door on the past. You don't try to forget the mistakes, but you don't dwell on it. You don't let it have any of your energy, or any of your time, or any of your space.
I can't wait for my little sisters to start dating, because it will really be fun to pick on their boyfriends.