Yes, the madness has started. I've been working for about an hour and a half, and I have about 1598 words. Not a terribly fast start, but so far it's a good one. I'm not sure if I will get all of The First Open Door done this week, but I'm going to make a nice dent on it.
It's unfolding the way I imagined, though maybe -- as is usual with me and first drafts -- a little too quickly and without some of the details it will need. But the story is good. I'm going to enjoy this one.