Brett,
I just finished putting on new seat covers an hour ago, so my memory is fresh.
The dryer certainly won't harm them, and I have even heard of putting them in the oven, but I don't recall how long or what temperature. You don't want to melt them.
I didn't use any heat on mine. The back seat wasn't bad, but I put new foam on the fronts, and trying to hog ring those rods running thru the seat covers to the rods on the seat frame can cause you to make up swear words.
That was really the most difficult part for me. I don't have pics, but maybe I'll get some this weekend. It's nice that you can follow along the holes in the frame, so you know where to put the next hog ring. My fingers hurt so bad right now, it's difficult typing.