OK, here is my two cents.
To answer your question, for a "test", I would try P90X and try the "plyo" DVD. Don't buy it, (at first) get it from a friend or someone who has it already. If you can do that through the whole video, you are in pretty good shape to begin with. If you can't walk the next day or can't finish half of video, you have a ways to go.
My theory on the subject of getting into "hunting shape" is that you can train all you want, just expect to be physically exhausted and huffing an puffing regardless. Really, besides doing it for real, there isn't a way to train for it unless you are doing it. I just can't train for 6-8 hours a day and, depending on the day, you could be going for 12 or more hours. Think of it this way, how is an hour or two on a tread mill or stair climber really going to get you where you need to be on the mountain? It will help, but even at max incline a mountain is much, much harder than a tread mill.
Do your PT but also work on the mind. Your mind is what will get you through the tough stuff, when you find your animal (that ran down hill) after dark and you are miles away from camp. I particularly have a weak mind, I have to constantly fight not to quit and have to play all kinds of tricks to ignore the knee or blister.
Do what you can and take your time. Try to pace yourself on the first day or two (if you can) and bring some ibuprofen.