You'll be a pro in no time. I still need to test which one of my lenses work well with IR.
Just look around. I'm sure some of the owners get tired in shooting IR and looses interest. You can get one around $500. I'm not sure about the prices down under. Just take note that some lenses may demonstrate hot spots when pointed against the blue sky. Most UWA lenses aren't so good from what I have read.