Yeah I get what you're saying. I thought maybe it was more the EMDR that has you worried but I guess it's just idea of being pushed beyond your limits, be it exposure or EMDR or whatever, facing cues or memories or situations that might get you triggered big time, especially if it's a new therapist or someone who doesn't really know how bad you have it. Like you don't feel stable enough to expose yourself to anything that can be really triggering.

I'm sorry for what you're going through but just go in there and tell them where you're at emotionally. Remind yourself that you are running the show and that all this is about helping you get better. Once you frame it that way, just see how you feel as you go along. Be assertive and share with them how you are doing. As others have said, it does not seem that people go into the main part of it right away. They build up to it. Perhaps yours will be similar too.