I used Minovation when I went over in Oct 2002. Fantastic help from Min and the gang. Contact Min and she will fill you in on all the latest paper work requirements. Then it's just a checkout to familiarise yourself with Jandakot.
The flying is easy, just make sure you plan ahead for fuel, not every airstrip offers fuel. You can get charts and airfield guides over the internet, ask Min for the details.
I went during Oct, weather near Shark Bay was v.hot and windy at Perth was hot with a few days with showers and down south near Albany/Esperance was warm and showers (more Showers than Perth).
Enjoy
smithgd