Point 4 of hopeac's earlier posting:
"Can you survive long periods of aloneness, and lack of family support, and mentally strong enough to take whatever comes. Periods of self doubt", and may I add: lonliness. I think this is something one do not quite anticipate until u move over, unless u hv a network of family n friends to begin with. One who rely heavily on family support while in Singapore will need to be strong enough to handle this. The couple relationship will also be put under pressure.
I think one should also be equipped with an understanding of their personal tax, medical n insurance system. It work very differently from Singapore. All these will impact your bring home disposable income n living standard, depending on your family structure, income level... amongst others.
Yes, depending on which state u will settle into, one do hv to queue for a good (private)school. And at some private schools, the annual tuition fee for year 10 n beyond can be in excess of 10k easily.
Allow me to add a personal comment: if u want to leave singapore becos of our fast-paced city life, then dun settle into a city like Sdyney n Melbourne. They are no less stressful. They are nice for holidays

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Good luck to those who are there (here), and for those "work-in-progress", do your homework thoroughly.