I did it years ago. Was a bit slow at first but later really paid dividends.
Probably the best thing is get together with a good ATO testin officer or watever they call themselves now. Get some guidance about what they're expecting when they show up on test day. Also, get a sample test form. Pobably download it from CASA website. It will give a broadbrush impression of the requirements. It will also help to eleiminate the "you've got to do 20 briefings and 30hrs training and a 737 endorsement first sonny boy"
I preparred 4 long and 4 preflight briefs I think. Plenty of backseating other IFR navex's and a couple of training flights to get the patter in order. The test itself was 2 long/2 preflights and the test form stated 2 flights of approx 45 minutes each but we did it in one 1.5-2.0 hour sortie.
My first point (talk to ATO) would be the best thing i could suggest.