I had my mind set on moving to QLD for uni for a while but I eventually had a change of heart.
The application process isn't difficult. For nsw, you apply through UAC, for qld its QTAC, victoria VTAC, and i think all the others go under SATAC. all states use ATAR as their metric except QLD, who use 'OP', and there's an OP --> ATAR conversion table out there somewhere.
so yeah applying generally isn't the hard part, i'd imagine living there on your own to be the difficult part. i know a few people who have moved interstate. depending on where you go though, you can have a real ball of a time esp with no parents around. being surrounded by friends constantly and going out to dinner with friends whenever you feel like it does sound pretty nice. i think cooking is the main bitch - you don't want to be on that 2 minute noodle diet.