Different people react differently to elevation. And it's just something you'll have to adjust to. I've seen some very good athletes get out there and spend the first few days sick. And I've seen out of shape people do pretty well. Make sure you stay conditioned well and when you get out there drink as much water as you can handle. Lots and lots of water. You don't want to miss out on a good animal because you couldn't get to where you need to be. So be ready for anything.
-Jake