Anne Lamott's great bit of advice: "Everyone's entitled to a shitty first draft."
Doing Nanowrimo can throw you into an atmosphere of support, creativity, and challenge. It's exhilarating and a very fun way to spend November. The discussion boards there are well worth the signup. You'll find writers who are ultra-planners and those who write by the seat of their pants. For some people, cranking out 50k in 30 days gets the pump primed. So what if it's awful? You've written a huge bit, you and the page are no longer strangers, and maybe there's a paragraph of gold that you haven't edited the life out of yet.