I'm gonna keep it short and sweet here, friends. Last year was my first National Novel Writing Month, and I churned out River Rats, approximately 56,000 words in 25 days. I do know how to be productive, it just doesn't happen too often!
I'm sure all you writers are now gearing up, have your characters and plots in mind and are bubbling up whether this is your first NaNo or your fifth. We all have other things going on, things outside of our computers and brain children but first, give yourself a pat on the back for trying! So many people don't and it's sad. This world would be such a better place if more people just motivated themselves to start something.
I digress. Okay so the one major rule to finishing, other than 50 K words in 30 days, is...
GIVE YOURSELF PERMISSION TO WRITE CRAP!
Yes, you read that right. Because no matter how terrible you think your WIP is, no matter that it is not lining up with the picture in your head, no matter that you are sitting there going, "Ew, what reeks?"
It is fixable crap. That's what editing is for, people. I spent one month churning out River Rats and six editing it. And there will be another round by a wild child editor coming soon. (Probably mid November ;-)
So go ahead, write that crap! You can always doll it up later!