I'm a CA this year! I enjoy it a lot, but I've had friends who've been CAs in the past who really did not enjoy it. There are actually info session this week in Gilmour Hall 111:
Tuesday 2 - 3:30
Wednesday 5 - 6:30
Thursday 3 - 4:30
Definitely check one of those out if you can, and the Residence Managers can answer any questions you have.