welcome porcelain
I attended the one in Sydney just recently... now just waiting for that phone-call... or email
The help/info I can give you are as follows..
If you make it to the one on one, try and not talk too much.. Keep your answers simple, clear and straight to the point. If they want to hear more they will prompt you to explain in a bit more detail, or provide another example...
When advising on a weakness, tell them one that you have had and what steps you have taken to improve that weakness. Always end in a positive note with questions like that..
Good luck and I really hope you get a call to attend the selection process. The recruiters at mine were both very lovely. Try not to stress too much and remember to smile, you should be fine. Let us know how the day was
D