In my younger days, I did freelance editing/proofreading as one of many jobs I managed from home to keep food on the table. Still do some now and again to help out friends. I'm sure you have a wealth of resources for it, but if you get in a bind, I'm only ever an email away. The back-and-forth of a manuscript and the editing of same is so easy now compared to back in the day with reams of paper to transport, read, and red-pen!Ho...lee...crap
This proofing/editing thing is rigorous/tedious/aggravating all rolled into a hand basket
I don't know how writers do it...or why
Seriously @Gary O', I am more than happy to help if you need it.