Hi Tracy & welcome!
I'm a nurse & in my case with the permanent 190 visa I could sit either the general or the academic IELTS paper, as it depended on points required, more points are awarded for the academic, so check the requirements of your visa. As mentioned above don't underestimate it, I have an A-level in English as well as my nursing degree & I found it tough going!! I recommend lots of preparation & revision, the books published by Cambridge Uni are fantastic, providing many key revision tips & suggested answers & writing styles (I have copies of both levels if you are interested in buying them) also there are numerous websites that have access to free past test papers, which are worth printing off & doing. After doing past papers I discovered the reading part the most difficult for me, as I always ran out of time, so consequently I concentrated on this part more than the other 3 & I'm so glad I did as the test was quite challenging, so I definitely say lots revision & preparation is key to the IELTS.
I'm actually in Adelaide right now on my visa validation & research trip for 3 wks & lovin it!! There are lots of casual/pool opportunities for nurses here, very few permanent vacancies. If you haven't already, I would suggest you register with SA health careers, which is like our NHS jobs site, almost all hospitals & healthcare agencies advertise their vacancies on here & once you have submitted your personal preferences, skills, interests etc. any vacancies matching your criteria will be alerted to you by e-mail.
I've organised a meet up at Doncaster M180/M18 services on Sunday 13th October at 12 midday, where a few PIA members are gathering to share experiences, ideas etc. if convenient you are more than welcome to join us.
If I can be of any help with anything please just ask. I found the help of people on here extremely useful & still do!!! It's gone by so quickly, it doesn't seem that long ago when I was a newbie asking all the questions, now here I am almost at the end of my journey & it feels so good to be able to share my experiences & help others.
Good luck with your journey & no matter how hard it becomes, when your patience tests you & the doubts come & go, have faith, stay committed to your dream & believe you can do it & you will.