To answer a few questions in this thread:
- Acceptance and enrolment procedures differ according to the uni. Acceptance can generally be done online through a link from the UAC site at 9pm on offers day (except when your uni stuffs it up like ANU did last year...) Enrolment at some unis (e.g. UNSW) can be done online whilst at others (e.g. most courses at ANU) you have to enrol in person on a designated day.
- If you're selecting tutorials at the same time as enrolment (which seems to be the case at UNSW?) then it's definitely better to enrol ASAP. Again each uni has different procedures for tutorials, and some unis different classes have different procedures so make sure to find out how it works with the courses you're doing. I've seen people not realise that tutorial selection has opened, then return to uni to find they're stuck with almost no choices at all.
- You can receive both Main and Late offers - if you want to receive a late offer, make sure to change your preferences around after the Main Round, and if you choose to accept the later offer, you must notify your Main Round offer provider of your withdrawal. In the meantime you can accept and enrol in your Main Round offer - you don't incur financial liability until the HECS-HELP Census Date so you can do it without any consequences.