Jeff,
That's a big move, especially going back to school. Sometimes the best move is to simply make a move. If you were not happy in your current line of work, why not take a change and move on. I spent the better part of 10 years in the mortgage/finance field and did very well, but the stress level of middle and upper management was really taxing. I needed to make a move.
My love has always been building/construction, and I had no idea how to make money doing it. I had the management/sales skills, but no hands on experience. I hooked up with a large construction company I used to do financing for as an independent estimator. My family thought I was nuts after I purchased a large pick up, ladders, levels, etc...
That was back in 2001. I'll probably do this for another several years, then try something else (retire at age 42 and work as a golf pro
). At first I thought it was nuts to work for myself, without benefits. After doubling my income, I never looked back.
It seems as I look back, every major move I made was always for the better. Some say you only get one shot in life - but that's not always true. The way time flies, it seems if you make a move and put your heart into it, it generally works out for the better. If you enjoy what you do, you'll be more productive and have a better outlook on life.
Good luck in school, and enjoy your new field.