Hi Jay,
As Matt said, they'll want to give you a check flight first, might be easier on you if the hire ship is similar to the one you're used to, that way you can concentrate on the experience of landing on a foreign field, - it's a great feeling! My first fully solo nav was Forbes, West Wyalong (touch 'n' go on their gravel strip), Cowra (stopped and was offered a cuppa by the friendly folks at the Flying club), and back to Forbes, a great way to spend a day!
My first flight from someone else's field in an unfamiliar aircraft type was at Swan Hill at Easter time whilst on holidays. The instructor was a real gentleman on the check-flight, and after an hour he let me go on my own. I think I did 2 touch 'n' goes and then came in for a full stop, I was exhausted! I'm used to a Foxbat and the Tecnam P92 had very different flight characteristics, but all-in-all it was an absolute buzz and would recommend it to anyone.
Let us know how you go at Margret River!
PF