Editing someone else's book

Let me sing praises to all editors.

HOW DO YOU DO IT, YOU AMAZING PEOPLE?!?

I'm on the other side for the first time, editing for R. E. Vance his magical series called Paradise Lot (the upcoming books,to be published soon). There are all kinds of mythical creatures in them, every single one you have ever heard of and more. Turns out, editing is hard work, dammit. It's so much harder than editing my own shit that it doesn't even compare. And though I have just started doing it this week (Or l...