well of course you have to try one first
and before that think about, what do you think makes a good therapist. What do you look for, what are your expectations. Do you have an idea of condition you want to be after a good amount of sessions?
And then maybe think about whether you would imagine a female or a male therapist, to be best for you.

I would say good results, and good signs can come pretty fast. And I would break it down to my first post in this thread = if it hurts, it works.

good luck!