I completely agree with the other posts as to rating a T. Recommendations from others is usually a good way to go. You can usually check certain credintials and licensing through either your insurance or your state licensing board. While not foolproof by far......most states have an online locator for license verification which lists status and any disciplinary actions on the books. This will tell you the legal stuff, but not how YOU will or won't connect with a T. The link below has listings of state licensing agencies.
http://www.psychwatch.com/license.htm