#1 on the 10 Secrets article StopDog posted:

"Most therapists honestly believe they can help most people with most problems. However, until you get in there and start working with a therapist, a therapist can’t really predict whether they’ll be able to help you or not. Most therapists believe they can help anyone who comes to them with a specific problem they’re trained or experienced to handle. However, every single individual is unique and there are few reliable predictors of any given therapist’s success with any given client."

Each individual is unique. Specific to the OP's question, there is no way a T could answer those questions up front unless they are one hell of a clairvoyant, or, have robots for clients.