Simple and straightforward. So often we hear people dispense advice about how to do this or that, but yeah, sometimes you just got to say "Yeah, I'm doing this. Get out of the way!" It may suck, it may not suck. I treat writing a book like skydiving. It may be the most terrifying mistake of my life as I go hurtling toward the ground since I don't know how the hell to skydive, or it could be the most exhilarating experience ever.
Yeah, I think Nano provides a good opportunity for people to just write, without all the worrying of "can I do this?" that tends to plague new writers. Taking chances with a piece of writing is important.