It seems like trying out a new T is kinda like dating. You check each other out to see if you're a good fit. Although I have only had one therapist, I DID go see a 'substitute' T while she was on vacation a couple of times. Although the sub was a nice person and there wasn't anything obviously wrong with her, I just KNEW she could not be my T. It's all about connection, in my opinion. Good luck.