I've been tangentially involved in 2 books (1 from start to finish) and there are a number of people that will contribute to editing and making sure the content

I've been tangentially involved in 2 books (1 from start to finish) and there are a number of people that will contribute to editing and making sure the content is solid/flows well. I was surprised by how much post production happens after the initial draft is written. As I recall, our biggest cash outlays were marketing and editing.