They did make it sound like a lot of work. Having done it a few times, I found it easier to write in a word processor. I prefer LibreOffice. I’ve also written in Markdown and HTML, but, for me, a word processor was easier because of the other items they mentioned needing. You can add front matter and Table of Contents easily in a word processor like LibreOffice.
In fact, I have a very short book about my step-by-step process on how to format and publish your own book with LibreOffice.
I recently wrote a blog post giving the cliff notes version of the book in a couple pages but I seem to have accidentally deleted it. I need to go dig it up.