Try to hold out as long as you can, nsw rego is shit, if you get pulled up just say you just moved here, not entirely legal, but works until you get told otherwise. On the other hand, if you want to do it, you need to get a green slip(CTP insurance) a blue slip (roadworthy inspection) and your current rego certificate and go to a RTA office and they will change it over, but you need to change your licence first.