If I pierce my ear up the top by myself with just a pin or needle will it hit any nervs or anything like that.I want to pierce it any where up the top is that OK or bad

It will hit nerves.
It will hurt.
People get horrible infections from piercings, cuts, bites - I was in the ER with a massive infection from one tiny little hole. Bacteria moved in and spread like wildfire.
That is why there are laws about age, and laws about licensing.