I think my only advice is don't be afraid to go with your gut when picking someone, even if it feels judgmental or irrational. This is one of the things in life where your own comfort is paramount as a starting point.

Feel more comfortable talking to a man, or to a woman? Go with that. Do you get a weird vibe you can't explain from someone? Go with that and look for someone else.

It's also OK to look for another one if you don't like the first one. Just make sure the reason isn't because they're making you confront difficult things. That's the whole point.

Good luck, and I hope you get some positive things from it. It's not easy, and it can be uncomfortable, but I personally have gotten a lot of clarity from it. Remember that only you can change you, though. All the therapist can do is reveal your patterns to you and give you coping strategies.