Buy some bitcoin
Set up account at https://www.coinspot.com.au/
Transfer bitcoin to your wallet at coinspot
Use bitcoin to buy IOTA
Then you can leave it in your wallet at Coinspot or transfer to your IOTA wallet on your computer.
Just did it, worked fine. The process of transferring to your local IOTA wallet may take up to 45 minutes, so don’t panic, just relax. It’ll get there.