I wish I could describe the pain of attempting to find solace in confronting someone. The flood of memories attached to that. Honestly NOTHING can prepare you if it goes awry. There aren’t enough coping mechanisms to distance yourself from it. For me the panic attacks, the flashbacks, all of it became a 24/7 onslaught. I will say I was not prepared in anyway. I hadn’t done trauma work nor grounding but I maintain it wouldn’t have helped. I began sucking my thumb and carrying a stuffed dog everywhere I went. I’d go to work and find myself physically unable to get out of the car, hours would pass in an instant. I stopped sleeping then I stopped being able to stay awake for any length of time. I started cutting, and became suicidal to the point of two attempts.
On the other hand if it brings you peace I imagine it will equally be a flood but the flood could be helpful.
So I echo others voices here. Ask your T. Tell them what you’d like to do and let them weigh in. They are more familiar with your mental state and your coping mechanisms. You may think EMDR has prepared you because I’m sure you experienced a flood of something near the beginning of the experience. I did too and the only thing that made it seem unbearable was thinking it might morph into what I experienced by trying to find peace with my abuser. It didn’t, thank god. It was as intense but for a few days not an entire year.