That is the tricky part- take your time look them up online and see reviews and websites..
and sometime you gotta go with your gut feelings.

ask a lot of questions at first visit or first phone call or email - good explanations & logical answers are good
I always like it best when a care provider explains what they are doing & why..and takes time to reply if I have a concern

if you feel they aren’t listening to your concerns - that is bad
if you feel worse after treatments- that is bad. unless they tell you a reason why..

If you feel that it isn't working out, cancel and find other care, don't stick with anyone that is not helping you.