After reading many times that it's far better to do the course, or at least see the method in action, rather than try piece it together from books (and I'm going from CMAA's pdfs here, not the new resources), I'm curious to know if this would even be possible for someone in Australia.

As a bit of background: I have the teacher's manual for Words With Wings and started using that to prepare our almost monthly homeschooler group for singing Puer Natus at a Christmas concert. I've been going through chant with them for years, and my own four boys kinda learning by immersion. And there's the local adult choirs I'm helping out with too. I'm not trained, so picking up tips from this forum is great.