A couple of things that lawdart said that I agree with.
You are taking a chance that you may not like the new career...and that would hurt considering all the sacrifice you will go through just to get there.
Sometimes instead of making a drastic change all at once, you can do it in steps. It's extrememly difficult to go DIRECTLY from apples to oranges.
Is this new career something you can do part time to see if you really do enjoy it ??
To use myself as an example, I started on my new career path in 1998 and I'm still a year and a half away.
I had to take small steps.
Hope this helped