Here's the FAQ for the most pressing questions about quantum magic, the art of bending time and space to your will.
A: Yes, but don't.
A: No, your past self is a mess of regret, self-doubt, and questionable life choices. Trust us, you don't want to meet them.
A: It's safe in the sense that it's not going to kill you... probably. But it's not safe in the sense that it's going to change everything you thought you knew about the universe, and that can be a real trip.