Easiest way to to it in cold weather leave your deer in the cold about 3 days, this will age the meat and make it taste better it also makes it easier to cut with a saw. Get yourself a sawz-all it is a good investment and get yourself A flexible fillet knife. After it hangs for a couple days start by skinning it wit the fillet knife the adjustable blade ones work better if you have one. First start by cutting out the back straps then cut down the front of the ribs with the saw, after cut the ribs into two so you will have four racks of ribs. Then cut the legs off at the hip and the same with the front legs. After cut the meat of the neck with the fillet knife. Now you can debone the legs. As for the grinder get it from cabelas, it will be cheaper, and unless you go commercial a manual grinder is fine. In about 50 degree weather a deer can safely hang about two days any colder like 20-30 degrees, it can hang for a long time, I fyou have a barn and it is about 50 degrees hang it in the barn it will be alot colder.