One of my friends was having a bout of perfectionism lately. It reminded me of the best advice I ever heard on this topic.
Six or seven years ago, I was chatting with a friend from SIGGRAPH.
Me: [obsessively nitpicking over whatever I was working on]
Mark: "Why are you being so perfectionist?"
Me: "I want to make this perfect!"
Mark: "Michael Jackson wants to be perfect too, and look at him!"