Miss C, my experience is a lot like Luce's.... This year i am now invited to groups so i have jumped on every one. It is a relief to see that T is the same with everyone else as with me - and I actually smile when I see the facial expressions; almost like T and I are sharing an inside joke because we both know this 'tact' that the person is trying isn't going to fool t. ANd like Luce, there is always one that dominates *grrr* but even that is a good learning experience. Last group I learned to speak up and ask this person to please stop. It's the hardest thing I've ever done - it didn't even really work, but it helped me build experience. And on the worst day, T had me spend some extra time in her office recovering.
In my current group, every week i say "If this is how this group is going to be, I don't think i can stay in it..." And we talk through that and T helps me learn. I have the ability to quit if i need to. In fact, I'm in 2 groups right now; one with the other group t from spring, and one with a different lady. Both are really super hard and deep and taking their toll on me - and really important. This is a whole new level of healing. And I do like the friendships I am making in my groups - they are really valuable.
I think you are very brave for considering this - and know that in the groups you get to say or not say what you like. It is scary at first, but it is like a safe scary pretty quick - with everyone facing something similar together.