I think the above-mentioned points/questions are good for starting a conversation with yourself and/or your current T.

I found that when I started seeing a therapist experienced in one of my specific traumas, it felt easier to open up about that stuff. It's not that my past therapists have been necessarily difficult to trust, but this one asked some very specific questions that no one had asked before... She also does a lot of CBT and DBT stuff, which is good in a pinch (though not my preferred style)