You can easily hire a professional copy-editor. In fact, in many instances publishers hire outside third-party experts depending on the subject of the book.

Publishing a text-only book with no or minimal pictures is shocking inexpensive.

That's a great insight. I am planning to add some graphs but theycanbe black and white. Maybe that doesn't add much additional cost?

To add to the comment form nickkokonas, I'd also add that there is a distinction between editing/tech review and copy-editing. They can be done by the same person, especially if you've had at least some serious read-throughs by people you trust who are familiar with the field.

But you basically need a content review and a review for flow/grammar/spelling/etc.

I've self-published but my objective has never been to make money. It's about supporting other activities that I get paid for. (Which is the situation with a lot of the lighterweight O'Reilly and "Dummies Guides" types of things these days.)

Thanks! I haven't thought of content reviewer but that makes sense. The only issueis that the reviewer would have to know both Finance and Technology, similarly like myself.

I recently obtained a copy of _Authority_ by Nathan Barry, which seems great so far.