hi photofreak, i'm so glad you posed this question! many of us have successfully been helped by pdocs and Ts. a lot of the majic is to find someone you feel is a "good fit". like someone who you feel comfortable with...usually you will know this pretty soon. i can't see any reason why trying a new T would be a negative thing. since the ocd and tourettes have gotten worse lately perhaps you and a T could unravel these challenges together. just me, but if i tried to do it alone i'd be in a mess. it's too complicated for me to untangle by myself.
so, yes, i'd say give it a go. one thing i had to learn about therapy was what i put into my sessions=what i got out of the sessions. it's our "job" to talk about what is bothering us and taking "ownership" of our own therapy. you say you're a teen, so that means you can do this.
i hope you will keep us up to date on how you are doing. we care about you!