I'm new here and I see that this thread is rather old, but I wanted to weigh in because I did something similar. It was a dead end for me. Your experiences could be very different from mine, of course.
You can get an idea of how good you would be as a therapist by volunteering for a local community service such as a suicide or crisis hot line. You need to do this anyway. Acceptance into clinical psychology programs is extremely competitive, and you will need some kind of volunteer experience like this to have any hope of being accepted into a program. When I did this it opened my eyes into how severe other people's problems can be compared to mine. You aren't advising someone on making a good career choice or dealing with some stress problems. You are talking them out of killing themselves. People call who have serious mental disorders, drug addictions, and very twisted lives. I never actually got on the hot line. The training was fascinating, but I couldn't handle the role playing at all, and the leader thought I laughed at inappropriate times when she was telling stories about some of the calls they received.
In school I aced the undergraduate classes and really impressed the professors with papers that I wrote and the work I did on their research. (Research experience is another critical component for getting accepted into graduate school. You will need to become a research assistant to several professors.) I got letters of recommendation with high levels of praise, and I was invited to interview for clinical programs at four prestigious schools. However, I am horrible at interviews and did not get accepted at any of the schools. Frustrated, I switched to applying to an experimental psychology program--much easier to get into. But that was a mistake for me. My Aspie tendencies led to me spending a lot of time in an isolated office and not making any friends. My degree only qualified me to teach and do research in a university, and by the time I had finished my Ph.D. I wanted nothing to do with academics any more.
I see that you refer to Myers-Briggs personality types. The first thing you will discover is that psychologists, at least the ones teaching your classes, have no respect for the Myers-Briggs. Personality types in general are a problem for psychologists, because the way people act varies too much depending on the situation. The Myers-Briggs has no scientific basis, and is about as meaningful as an astrological sign. That doesn't stop career counselors, human resources people, and even therapists in private practice from using it, though.
The second big disillusionment will be that your grand theory will not get much respect. You go to school to learn the methods of conducting research and the prevailing knowledge dictated by extensive research programs. Until you are an established researcher yourself, no one will be interested in your unique ideas.
The Ph.D. in clinical psychology is the most coveted psychology degree. But clinical psychologists are supposed to be interested mostly in researching mental illnesses. If you happen to help someone along the way, that's great, but research is the ultimate objective. Ironically, an Aspie is very well suited for that. But it's the kiss of death to even mention wanting to do therapy when interviewing for a clinical psychology program. Graduates rarely go into private practice anyway. Usually they wind up working in a hospital or mental institution.
There are other choices. The Psy.D. is more therapy oriented and somewhat less competitive. Counseling psychology is also more therapy oriented if you can find a program. A shorter route to doing therapy is either a Master's in clinical counseling or even school psychology.
Anyway, not to discourage you. Just want to give you an idea what to expect. Good luck in your endeavors.
