I think there is some great advice here.
If you have the will to work your way up through GA, you and your family will be eating ramen and changing schools every couple of years.
Doable? Sure.
advisable? Not really.
Honestly, I'd wait until qantas and/or Jetstar release their cadet program again. See if you can get into that and circumvent the GA route.
The amount of people that get themselves into crazy fee help debt and decide to ultimately do something else is pretty high, and lots of these are single high school graduates.