Law Number 1: Never purposely change the course of History
No matter what it is, no matter how small, never alter history, ever. This is an endless stream of paradox that will probably, lead to the end of time, the universe, or just pleasentness.
It doesn't matter how small it is, like moving a rock so you don't trip on it like you did earlier that day, will then cause you not to move it because you didn't need to. Do not come in contact with yourself, you'll just go mad, or people will assume your mad for saying you saw yourself. Do not take the chance.
However, this law does not apply if it's done by accident. Lets say you went back in time for sight seeing. God knows why you did this, but you did. Say, you accidentally push over JFK's killer, for example, not knowing, it was he. You just saved JFK, finding this out, you panic to go fix what you have just done because this wasn't supposed to happen, well don't, now this law goes back into effect. Never purposely change the course of History. It's a horrible stream of paradoxes. Please feel free to comment with questions
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The Law is Absolute
The expectations of custard is apparently a great way to relieve pain