I just use a handful of macros and a lot of find+replace. Then I proofread. If the source is The Internet Archive or Google Books then a close proofreading is essential. With new PG texts, this can be abbreviated considerably.
Currently, I'm doing some Laura Ingalls Wilder. In my source file for "On the Banks of Plum Creek", "Creek" usually appears as "Greek." This is weird, but quickly replaced.