Take a few weeks break between each write, you will start to see areas that are clear and those that you will not like. Connect the flow of paragraphs and chapters to each other - hard to see all this when you first write it down; but after taking a reasonable break - you will start to see which areas to change.
I get your point on not being a teacher, but I would recommend doing it as blog posts then and not a book, a book implies something much more. Or maybe I’m just old school and not for the current times. After all, there are countless of ebooks of questionable quality on various programming topics.