The principles *used* by AAs are limited, that doesn't mean they can't teach you obscure stuff you'll never remember. The class isn't particularly difficult, if you did OK in undergrad physics then you will be just fine.

Honestly, the hardest part of school for me was just the sheer workload of managing 4-5 courses at a time and going to clinical a couple days a week. That will grind on you more than any individual class.