To make the most of your counseling sessions actively work with your therapist in the process.
Research has computed that up to 40% of the end result of therapy depends on factors related to the client.
That's a HUGE chunk in your court!
21st psychotherapy isn't just talking on end while your therapist patiently listens. It's a collaborative process. And the more you're able to talk about the experience of being in therapy, the better your chances for getting the most from it.
(Personally, I believe that the more you know about the process - the better you'll know what to do to get the results you want. Btw, this notion is NOT endorsed by all therapists.)