I have done EMDR with a t who has experience with trauma. Mostly Ptsd and bpd. I believe it is recommended for treating all kinds of trauma. I do not find it scary or hard. I can raise my hand and stop it at anytime, but I have never felt the need to. I feel like with EMDR my mind knows how far to go. We started with unpleasant memories rather than awful ones, so that probably helped.

The process for me was to think of something unpleasant, identify which belief (off a list) was caused by the event, and then I look at another list and find the belief that is opposite. Doing the emdr I just let my mind wander. I can stop it from going somewhere that I don't want it to go. I am able to control my thoughts, but I am usually ok with just letting my mind wander.

We also use EMDR to strengthen good stuff. Either thoughts or experiences that feel good. Sometimes stuff that I have done that I am proud of, sometimes pleasant feelings. One of the first things that we did was to find a "safe place" which is an imagined or real place that feels safe and relaxing. For me, that is a campfire with my horses nearby. If things get hard, we just go there mentally. We reinforced this with EMDR as well.

Eta: I have DID