Totally agree. It's very hard, especially since when writing fiction, and the kind of fiction I wanted to write, there are a lot of things you doubt about yourself: is my style as good as I wish? Are my stories and my characters strong enough, with the right motivations? And I bet many of this ingredients are still there even when writing technical books if the goal is to do a very good job. Teaching in written form, with a book, is like a long story that must fit, chapter after chapter, sentence after sentence.