Yeah you'll want to have your aussie/US minimums before you embark on getting an FAA conversion. You need from memory 1500 TT 100 night and 75 instrument. If not you'll want to get a curriculum set out for you from a FAA flight standards office. It may take you only 5 hours it may take you 20 depending on which FSDO you talk to . Anyway. get your facts straight before. All the best