instruction, it can be highly variable from student to student. When I have tutored a subject privately, it made an enormous difference in my approach and attitude if I had an enthusiastic and eager student. It became a win-win situation, with myself also gaining knowledge. If, on the other hand, I had a student that expected to be 'spoon fed' the information, with no effort on their part, it became a chore and I disliked my position.
I guess what I am trying to say is that I think that your idea is a great one, I would just suggest caution and selection of your students. Teaching can be the most rewarding experience, and also the most difficult. If you receive students that are motivated and willing to work, it would be a job many would be envious of. Also the one-on-one aspect can be fantastic for developing skills that are difficult to ascertain in a group environment.
Good luck and let me know if you are moving to Texas? I think that a lot of us here would be thrilled to work with you.