Whenever I can I prefere to hang the animal from a tree limb and dress and skin it off the ground. Buffalo I skinned first starting the first cut along the back bone. In this way I could fold the skin toward me giving me a clean inside skin spread on the ground and I could butcher and lay the meat on the inside of the skin.
With an animal the size of the one in this video, I field dress much the same as shown except that I use a tomahawk instead of a saw, and then carry the game out either on my back, or hanging on a pole if there are two of us to carry. I have also constructed a travois to get heavier game out of the woods.