Since your girlfriend got them for you, I suppose you should probably give them a chance... Give them a secure cage with good hides, and plenty of time to settle in. Other than that, I don't have enough experience to help much. If they are nippy, you can get a pair of leather gloves to protect your hands. However, if they aren't nippy, skip the gloves, because it changes your smell. I tamed an anaconda with gloves, and she seemed like the sweetest thing. First time without gloves, she tagged me... However, she only tagged me once, compared to the 10-12 times she'd bite before we started, so using gloves definately helped!!
Are they babies?
If they're more than you can handle, and you won't know until you try, then I agree with everyone else, maybe you should try CB to start....