Pretty sure there is a list of books round here that will help you, check on the main page.

You could look at doing a calm birth course or something similar. I did a great course with Rhea Dempsy called 'Transforming pain in labour' But that was in Melbourne. .... Perhaps there is something similar in SA?

A couple of great books i read were.... oh crap. What were they??? hmmmmmmm................ Janet Balaskas, "New active birth" is one i read. Will come back if i remember the others! (ETA- if i only i had of refreshed i wouldn't have had to think so hard. )

Here, found this for you.... Birth - BellyBelly Pty Ltd

But i really think the most important thing is being comfortable in your surrounds and confident in your body's ability to birth your baby. Read all you can until you get to that point. Of course there is always a few nerves and a little fear of the unknown, but that is only natural too.