Here's a link to help you, from the American Psychological Association about selecting a (psychologist) but it works for therapists...

Ask questions...you might ask when you call the secretary/receptionist if the doctor could do a quick consult over the phone---you might not even like his/her voice! They often do that, before you make the first appointment. In that list of what to ask..be sure to ask if they have had many OCD patients they've been able to help?

Go for it. You can always change your mind--or the therapist!

http://www.apa.org/helpcenter/choose-therapist.aspx