I cut all my deer these days. Hauled my first ever moose to a butcher I trust, because I was not certain of the process for a larger critter, or certain that I would have the space or time to do it. It was worth the drive.
A good meat cutter is worth paying whatever he charges. His experience allows him to get as much meat off the carcass, in as little time as is possible. The butcher I use, has told folks that if they wanted their meat hung in his cooler, that they had best take it home and clean it before returning. He is proud of his facility, too.
Can't hardly find a fella that cuts game around here anymore, so I started cutting my own deer. A couple times through the vids online as a refresher, a roll of butcher paper to cover the work surface, as well as to be used as storage space for meat cut, but not yet wrapped, and a large steel bowl for the grind meat.
Lose 50 percent at the butcher? Yep. If he's trimming out the stuff you don't want to eat, anyways. I figure I come close to that when I cut and trim, and there isn't enough meat in my garbage to make a decent bowl of soup out of, but there is a lot of tendon, fat, bones, etc.
Unless I have a whole day set aside, I usually have been doing the front half in the first evening, starting with stripping off the backstraps, stripping the foreleg and shoulders, then picking over the rest of the front. The hind gets done last. Bigger chunks, less trim more larger bones in the back end. Easier to deal with when I've already had a long day or two.
I try to get the grind meat all cooling off while I package the rest, then grind, then package that, then wash up.
Cheers
Trev