Despite some heart-stopping stuff, we managed to hold Netherlands 1:1 in a friendly.
In an earlier friendly we beat Greece (ranked around 20 in Fifa/CocaCola table)
So against Croatia and Japan (around the same levels as Greece) we are in with a chance. And we can hold Brazil (mind power, mind power, bring on the psi-wheel

We have also held Uruquay (1-0,0-1) who are also in the 20s.
So we are not mixing it too far out of our weight range, despite the fact Australia is ranked in the 40s.
BTW, do the Fifa/CocaCola rankings seem pretty strange to you?. There seem to be some unusual teams ranking up there.
Perhaps it is too sluggish because it carries too much past history?
And perhaps the weighting needs adjusting, esp the relative strengths of two teams? For eg, Brazil beating Botswana will not carry as much weight as Botswana beating Brazil. Maybe these should be ramped a little.