I was totally freaked out about going to an AA meeting. What do I say? Where do I sit? Do I have to say anything? What if I do say something and it's totally wrong? What if I'm a few minutes late because of traffic after work?
What I did was walk in, say hello to the person I sat next to and said, "I've never been to a meeting before, would you mind guiding me along?" Of course, I got the perfect answer of "absolutely, girl! Welcome."
You could also go a little early, say 10-15 minutes and speak to the leader. I can PROMISE you that they'll make you feel comfortable and safe.