I have cooked or been involved with cooking whole and half hogs on a similar cooker, but other cuts should work the same. It is homemade from a fuel oil drum and has a door on one end at the bottom. We burn wood in a separate 55 gallon drum that has an opening at the bottom big enough to put a shovel through and a rebar grate just above that opening. As the wood burns and the coals fall through the grate, we shovel those into the cooker through the door spreading them all around. There is no exhaust or other dampers on the cooker. As the temp on the cooker cools, we will scatter one or 2 more shovels of coals around. It cooks like an oven except wood coals are the heat source. The only thing in the lid is 2 temp probes, but I have thought that the next time we cook on it, I'm using my digital probes.
Looking at yours, it appears to have 2 doors on the front that are for loading in more coals or charcoal.
As previously said, for whole or half hogs, wrap in chicken wire to make them easier to flip...