I can't quite remember how we did it, but we bought our old 32 off mansoor in NSW, while we were there we went to the RTA and transfered the rego into our names, he had to sign a form and andy had to sign a form. Then when we got it back here we just transfered it to a qld rego, no cert needed. That was 2 years ago and I know rwc's are a requirement now, although i'm not sure if they are if the car is already in your name (as in, been transfered from the old owner to you in NSW). We got lucky, the bird on the counter let us keep the plates, they were personalised so they're stuck in the garage LOL
Anyway see how you go, good luck
Anna xo