I personally make a few zillion passes over my book, make it PERFECT and ERROR free, then hand to my editor who I think is putting errors in just so that she can find something to fix!
I dont mind the editing/revising ... I despise the MARKETING. Ugh!! I just lost an hour trying to find a review site that is CURRENTLY taking spec fic and does not have a multi-year back log. Still not found one, and think my head gonna explode from some of their page designs. Wow. I would happily pay some one to do this for me!