I'm also heading to Sydney on my own (in a few weeks
) although I'm going to stay in a hostel for the first few days/weeks until I sort out a job and apt ........ or who knows, maybe I will just head off up the coast !
It's a bit daunting alright - but hey - the way I look at it - If we didn't 'have a go' we would probably regret it when we are older
(P.S. Have a look at the info on Oz bank accounts in the Aus/NZ/Fiji section).
Best of luck,