DarlingDuck yanbu if that is what you and your dh really want, BUT as most other posters on here have said, you do need to do your research. And does it have to be Australia - have you thought about moving to other countries overseas, even if for no other reason than to have a comparison?
As well as looking at what midwifery qualifications and experience are expected for certain rates of pay, I really recommend you look into what exactly the work will be like - roles and responsibilities - as I rather suspect it's quite different over here compared to the UK.
As well as the British Expats forum you could try looking on www.pomsinoz.com/. I spent a fair bit of time on both of those sites before we moved over.
We moved over to Sydney 6 months ago and I can't say I'm completely settled yet but that is due to many factors. The biggest difference in terms of our life is that prices are very expensive, as other people have said. And there are loads of things that we took for granted in the UK but have to pay for over here (like kids' dental treatment, ambulance cover, school stationery, gym lessons at school etc. etc.) Rents are very high where we live but you can check them out on domain.com.au so you know what you're looking at. Just be sure to check out travel times as well so that you know how long it would take either of you to get to work. And my dp earns a pretty good wage but we really still have to watch what we're spending it on.
The biggest worry so far is that ds1 hasn't settled in very well. Everyone says it will take time, but it is one of the largest factors in making us wonder about whether we want to stay permanently, or might move back at some point.
I don't know if you've posted on Living Overseas yet but, as someone else pointed out, there's loads more info on those threads. And if you put specific queries on there you're likely to get some good answers.