We asked around our friends and also a couple of midwives for recomendations and then rang the Dr of our choice to find out how soon we needed to book, if we needed a GP's referal etc.
We got some of the cost back on medicare but not all.
Alot of Drs only do it before 6 weeks - the nurse of the one who did Imran was really suspicious of me because he was such a big baby and he was 5 weeks and 5 days when we got it done and she thought he was older and I was lying about his age lol.