I did Merced (California) to Hilo, Majuro PKMJ, Coolangatta in a Conquest in July. Legs were 8 hours/8.5/9.0
Everything was organised by Jacko at DBF Aviation and the export side through Tom Lopes at Gareway Air Center.
We struck July 4th delays before departure.
If you need it working on arrival in Aus, try to get all the Aussie certifcation crap done in the US because most of it is done by the FAA to issue the export CofA. Ferry on the N-Reg.
I would echo DeHav's comment, get a pro to do it and go along for the ride.