I would get a good book or use the www to understand the numerous cuts that can be got from the animal then make a cutting list. The "hidden cuts" as I call them are the less obvious and the ones that could be taken from you as a "perk". Shoulder and collar meat can be cut in several ways and I have even heard of people not getting the tenderloins back. Maybe the best way around this could be to ask for each side to be cut into 3 ( fore,mid and rear sections) with the 2 halves of the head, liver, kidneys and heart. Buy a good saw and knife and you may be a bit surprised how much meat you will have as cuts and trimmings for sausages etc etc Making bacon, hams and sausages is not difficult and less time consuming than processing the head.