If you're on the fence about a career change, consider this: 87 percent of career changers say they're happy they made the leap, and 65 percent report less stress, according to the American Institute for Economic Research. And while it always makes sense to mine your existing skillset, if you're pining for a fresh start, there are plenty of jobs that don't require more formal schooling (though some may require certification courses or on-the-job training). Here are 20 great second careers that won't require you to hit the books too hard. The salary figures come from the Bureau of Labor Statistics. And to make sure you're ready for the transition, check out 28 Ways to Prepare for a New Career Later in Life.