My hubby teaches at the college level, says he'd never teach at a lower level. At least in college, most of the kids know that this is costing either them or their parents money, so everyone is more motivated. He still has a few problems with the parents occasionally, they complain about their kids failing...or he gets homework from one kid that is usually nearly illliterate, and then suddenly nearly perfect because Mom did it...
His daughter wants to teach, and he advised her to teach the very young students...Kindergarten to 4th, because even if they're difficult, they aren't big enough to be terribly dangerous.
If you want to get a taste of teaching before making the big leap, a lot of schools LOVE volunteer aides, or you could teach a Sunday school class at the age you're considering.