I live in NJ at about 500', and in NM at about 7600' and climb up to about 10K'. Most hills in the west are shallow gradient, but very long. If you're motoring up steep hills in central PA, you will be OK in the west, generally speaking. You shouldn't need to adjust your gearing, just relax and climb at your own pace.

The key is relaxation and controlled breathing. Try to ride some flat'ish stuff when you get there to get in the groove. Oh, and make sure your brakes are in good shape. Those long uphills usually come with long downhills, for some reason...