As my mom can attest, I tend to think that things I haven't done before are really hard and that I won't be able to do them. Sometimes I'm right, but sometimes I end up being surprised at how easy something is. Take, for instance, housebreaking. I always thought it took some skill to pick locks, but yesterday I was able to break into my house in about 15 seconds.
I think my roommate was right when she said that we should use the deadbolt more often.