Incredible work! I'm writing my own book (obligatory mailing list link [0] and description [1]) and I wondered how you tackled the mental side? It is a bit of a rollercoaster I am finding. That constant fear gnawing in the back of your head 'is this really any good at all?' :) I suppose it is the price of caring.
Prior to writing my first book, I already published quite a lot of articles, so I knew that there was some non-empty audience set out there :)
I started a crowdfunding project for the first book too, so that the printing and typesetting costs get covered. They were covered fully, so I knew that I won't dip into red numbers as a consequence. (This was a major worry of mine.)
I was still pretty nervous about acceptance, but it turned out OK. Whew.
[0]:https://docs.google.com/forms/d/e/1FAIpQLSen0gefOrPWi6ZtEQ25... [1]:https://ljs.io/book.html