Changing careers at 9 years into a job, is it realistic? (Boston)

After 9 years as a software tester I am thinking about moving into a different field. There are 9 people counting on me, so I am trying to be careful. I have a little time and a small budget for training. Has anyone made a similar move?

Try a small project in the new field before committing. It told me a lot about whether I would enjoy it.