I have wanted to get into rock climbing, I think I would really enjoy it.

One day, while I was checking out some kayaking gear, I decided just to try on a pair of climbing shoes. They felt VERY uncomfortable to me. The sales person said that they do fit different because the toes are sort of curled in so there is no give. Ok that makes sense, but should it be uncomfortable? Or do you just get used to it? How do I know if they fit right? Any advice, suggestions?