I have been through EMDR with a great Psychologist (female) and it was really starting to bring some stuff up after I became accustomed to it.
It's not any type of hypnotism or anything like that, it's a way of forcing you to use both your right brain and your left brain when the Psychologist slowly waves some type of pencil, pen, that size of object to the furtherest right peripheral of your site and then back to the furtherest left peripheral of your eyesite so you are using your creative side and logical side of the brain at the same time.
Just make sure your EMDR person is highly experienced in trauma issues. Ask whatever questions you need to in order to feel safe.
It's definitely a non-threatening in any way procedure (except my Psychologist was pointing the pen a little too much towards my face and it triggered the poo-poo out of me because anything pointy reminds me of a knife and I have to hold my neck to protect it. So I told her on teh first day, and she obliged (of course).
I ran out of money (and a job) so had to stop when it was really starting to work and get up stuff that's been hidden (I disassociate very often) and once it's up, we can work through how to deal with it.
It'll be a good experience, I'm guessing!