After the semi-satisfying oral results, curiosity will (and it always does) win out causing you graduate, so you might as well cut out the middle man and begin now. As for needles, if your pain threshold is too low for a needle maybe you're just not tough enough for aas.
Nevertheless, pain only occurs when nerves are involved, therefore you can eliminate it. Should you strike a nerve upon insertion, pull back slightly (not out completely) and reposition the pin on another angle for a smooth painless stick.
