So I found another tutorial by RobA for an alternative way to create mountains, and I like the way those mountains look much better than the original method in the "regional maps" tutorial.
Here's what I've done with that second mountain method:
It's getting closer, but I'm still not satisfied with it. The mountains turned out pretty well, I think, but the forests look better in my previous post than they do in this one. Plus, I got a strange kind of ridge around the mountains that isn't supposed to be there...so I think I did one or more of the steps wrong. I'll have to go back in and try again, see if I can get a smoother result. Still, it's coming along.