Hugh Gorgen and others, thanks for the helpful comments.
I guess there's no doubt that my heart is in it- I would rather fly jets for Qantas than be a lawyer; I still have fears about the economic situation and the coming peak oil problem. I guess I am worried that I might borrow a substantial sum of money for my Swinburne etc. training and then end up with a huge debt and no job in 2 or 3 years time.
Still, nobody has a crystal ball I guess...