A.B.
Never done it, but I am going for it this year. (I was going to post about it too! Glad to see someone else on here asking about it!) If it makes you feel any better, I've got four at home (and we homeschool); while it's intimidating in terms of keeping life moderately under control, I am really excited about pushing myself with my writing. So far, I have approximately 22 chapters outlined, and most of my characters sketched. It's killing me to have to wait another 11 days!
I've got a group of friends who are also giving it a go, and we are all very eager for November 1st. If you decide to do it and need a cheering section, just send me a PM. And seriously, if you haven't signed up on the website, you should. I wasn't feeling very confident until I read through the forums and advice. Also, a big plus, you can organize it as much as you want to (outlines, character names and sketches, research, etc.) before November 1st as long as you don't actually start writing till the contest begins. Good luck and enjoy if you give it a shot!