As far as techniques go, I worked with a medical intuitive, and that's when I first realized I had hidden trauma. But there are so many techniques out there. I do a lot of journaling, and I write down the beliefs that were false/toxic, what happened to cause me to believe that belief, and what the truth is.
For example, I believed that it wasn't safe for me to care about myself my whole life, because when I was a kid I had traumatic things happen to me when I was injured/sick I dared to try to speak up and care for myself. It's interesting, I think in one of Louise Hay's books, she talks about how believing that it isn't safe to care for yourself is a belief that leads directly to adrenal burnout. So I've been writing down affirmations on cards, and I read them regularly, to remind me of my new truths.
I feel like there's more work for me to do, as the trauma still bothers me and it's not fully released. I've been thinking about CBT and EFT. Watched this video recently on releasing trauma using EFT, it had me in tears. I wish I could do a session like this.