a deer hide has to be thinned or else when tanned it and start to dry on the mount it will shrink and pull around the mouth, nose, and eyes.
if you salt the cape you are commited. A salted cape won't freeze anymore. If you just plaque the antlers you can get a cape later and have a shoulder mount out of it. Or else like what was said cape it out with a seven or v cut at the antlers and follow the spine back. You then can freeze it or continue on caping. Some say a hide if good for a couple of months, but in my experience I have mounted them almost a year in the freezer. If you can grab the hide and pull out alot of hair the cape is shot and cut the antlers off and get a new cape. If you want to do it yourself rhinehart has some videos out there and some home tanning supplies. They are pretty good forms with preset eyes.
just a few pics of my hobby:
as you can see when I mounted this one I hadn't had the finishing of the nose down yet, but I am still learning, around here you pay around $575 for a shoulder mount It will cost you if you do it yourself for about $200 that is with a professional tan. I don't do it much anymore because it started to become a job and I already have one I spend 60hrs a week at. If you have anymore questions send me a pm and I will share the limited knowledge I have.