Glad to hear your going to give Thursday a try! We are all scared about walking through that door for the first time.
A couple things that helped me was I was told to show up early, it is easier to walk in if there is just 1 or 2 people there. Tell them right off that this is your 1st meeting and you are scared, they have been there. I suffered from G.A.D. and panic attacks at that time and I was comforted by the fact that if at any time I felt uncomfortable I could slip out with no problems.
You will make a friend or two at that 1st meeting so the 2nd meeting is easy. You have friends there!