cleared my bike at the airport in Perth in -08, had no agent, was pretty easy. Carnet only gives you temporary import, you'll need to get a roadworthiness test for your vehicle, and then buy insurance. But before you can legally ride to the test, you need a temporary (48 hour) insurance...If I remember correctly, the place to get that was the Department of Infrastructure and Planning. Make sure the bike, as well as all your riding gear and everything else are very clean, to pass the quarantine check.
(But remember this was 4 years ago, some things might have changed already).
Last edited by pecha72; 24 Apr 2012 at 20:20.