1. Don't put it around children. To many fingers to bite, and too much stress for the animal.
2. I kept one, oh, 28 years back. To be honest, it was my favorite pet ever. So personable, so much personality, so cool. I miss that turtle a lot. I loved that thing. I fed it tender vittles soft cat food, which was probably stupid, but he got so fat.
3. They are easy to keep, provided you keep uber-clean water for them, temperature correct water and enclosure.
4. You'll need a very large aquarium with a very large footprint and a beefy robust filtration system.
5. You'll need good, healthy meaty foods.
6. You'll need to commit to an animal that is fairly long lived, grows to a considerable size, and cannot be housed with anything else.
In the end, I absolutely love snapping turtles, and if you can house it properly, I wish you every luck in the world, they are great animals.