How would I know if I have the right therapist?

One key indicator in knowing your therapist is right for you is that you feel comfortable around your counselor. Comfortability is key so, that you are able to open up to your counselor about the intimate difficulties that you are experiencing. It is necessary to communicate with your therapist about your needs in treatment. You cannot "train" your therapist to give you what you need in treatment but, you can be open and honest about what you want out of therapy with your counselor. If you do not feel comfortable around your counselor and don't see the relationship building in the future you might need to look for another therapist. 

Another way to know if you have the right therapist for you is that you feel like you are getting a benefit from going to the sessions. It might be helpful to search for therapists that specialize in the specific difficulty that you're experiencing.