Nonfiction, it’s all experiences that have fallen into my lap. I’ve been hesitant to comment much here even though I’m a longtime lurker. I have had personal interaction with many individuals discussed here. While employed I have been very hesitant to share but I’m recently retired
Biggest challenge is the organize the effort, do a bit each day, don't get upset if you find a spot that you aren't ready to work on, jump to another. Progress is better than sequential.
I'll send PM with more details and happy to chat.
I have always enjoyed editing and proofreading. Possibly I could help with that, such as word choices, punctuation, etc.
So it’s largely, if not completely, an autobiography. I’m in a similar situation, having started a book with two major parts, 8 chapters away from finishing rough draft of first part. Taking a break.
It tends to be a three stage process: rough draft (just spit it out without regard to details), revised draft (read what you wrote with a critical eye), then strict, professional editing.
Find a couple people you trust who can coach you. Never use the word “utilize” or I’ll come down there and tear up your manuscript.