I went to a school that also had a small selection of students that were HoH/deaf. First year there, we had to take a mandatory month of sign language! I wouldn't say it's necessarily a hard language, but I'll echo the sentiments that practice makes perfect. There is also a point about dialect - American Sign Language will be way different than, say, Japanese Sign Language. They may share signs, but the structures of sentences can be entirely different. So, you know, think about what sorts of folks you'll be communicating with when you learn and choose the appropriate sign language.