Ok, you're north of Missoula (you can fly into Missoula). One thing I would tell you is to GET IN SHAPE! The mountains there are that high but, for us flat-landers, the altitude will drain you quick! Start walking/hiking daily now. Last hunt I did up in Idaho I was in the best shape of my life. Hour a day on the treadmill working up to walking at 4 mph at 15 degree incline and in the 9 day hunt, eating about 4000 calories a day, I lost 14 pounds.
Shots can be from in your face to as far as you can shoot. Practice taking field-type shots out to 400. A lighter weight rifle is your friend. You may not enjoy the recoil from the bench, but in the field, you'll carry it a lot more than you'll shoot it. Get to know it!
Can't tell you too much about the game in that area but there is game to be found. Some possible good heads in the area. If you get the chance, take the first legal animal. Especially if it's an elk. Ground shrinkage doesn't exist for elk!
Not to mention, the elk is some of the finest table fare you could ask for.
Best of luck to you!