TERRIFIED of heights, narrow roads with drop-offs, etc.

Interesting comments on treachery of Teton Pass. I am also staying in Victor (Teton Valley CG which is lovely btw) and thought the 10% signs must have been old and the highway was redone and they weren't removed. I thought it was a nice peaceful drive-will have to pay more attention tomorrow. My advice was actually going to be to practice on this pass as IMO it's fairly tame compared to what you're going to encounter out west.