As SASless says, they are an everyday part of flying so if you only do them once a year they will worry you.
I found Slopes one of the most difficult things I had to learn during training, so every day I go flying (solo) now, I go to a little patch of 5 degree ground and do a few. Still a bit agricultural, but they are getting better, and I don't have that gut renching fear of attempting them.
Practice, practice practice.