Ken,
I've gone to two retreats so far that Mike Lew has lead at Kirkridge in PA. The first one was in 2000 and I had been seeing a therapist for 2 years at that time but had never been in a group situation. I had never met a fellow survivor before that time. I would be lying if I didn't tell you that I was scared to death.
I was a wreck for the first night and most of Saturday. I cried a lot, for me and for my fellow survivors as I grew to know them and know their stories and share mine. But just being there helped me, to be there was a statement, to be there was taking a stand. I had never acknowledged the abuse that happened to me in an open forum, to do so was so empowering. The retreat also allowed me to vent some of the 38 years of pent up anger in a controlled environment and I felt so relieved.
I was afraid of going the first time. I was afraid that I'd have a roommate who would be abusive or manipulative or ? Guess what, my roommate felt the same way, he was afraid of me too and what I'd be like! Some of the most theraputic healing came out in our talks late into the night. He and I still keep in touch and he is still someone who I can talk to. My roommate last year is the same way, though I havent' called him lately, I've thought of him and his courage often. Both of them have given me insights into myself that I wouldn't have thought about any other way.
To prepare for a retreat, first just try to allay your fears, the other participants probably feel the same as you do. Be open and willing to talk and share your feelings and fears. And lastly make sure that you have someone to talk to when you get back home. I made sure that I had an appointment with my therapist within a few days of returning.
I hope this helps. I'll be there at the retreat too.
Steve