There is always a kind of terror when you start a book. Will this work, will I succeed, how can I possibly do this?
So procrastination follows. It's a kind of avoidance, but if I don't write for a while, I get antsy, itchy, and I need to write something.
So I face it. The first chapter is horrific, and I tend to write and rewrite it many times before I'm happy with it, but that in itself can be a form of procrastination. Overwriting can kill a book.
Once I'm a chapter or two in, I'm away and going for it. I do love that part, when my characters are interacting and the story is working. But sometimes it doesn't work, and then I get my analytical tools out to find out what's going wrong.
Procrastination? Sometimes, but not always.