How to write a book, by people who have written a book

Mostly for "if I ever need to find this article again", but also partly as inspiration.

But now comes the hard part. It’s one thing to work up a 4000-word magazine feature and another to sit down and write a 100,000-word book… I’ve chosen to deal with my anxiety by tapping into the wisdom of the hive mind. I recently sent email to the authors in my social network and asked them, “What do you wish you’d known about the process of writing a book that you didn’t know before you did it?”