I've recently started editing books at home as a sort of hobby--taking raw text and formatting it for Book Fold printing in Word. It's a lot of "eyeball" work to make sure text is spaced correctly, text is properly hyphenated where needed. The use of Styles is invaluable to make sure everything is uniform. I'm curious if this is how professional book editors work or if most processes are automated by Word or some other high-end software.