Pillow man, im not positivly sure but i think u should transfer to the thief town. Then talk to the guy and Join the thief alias. Then i think u create an alias (which will show up as ur name when u put on a thief suit) and i think if your already a trader u quit the trading thing by talking to a trader dude at the trade shop and u have to like wait a certain amount of days bro. I havnt switched job :). hope this helped man