Im sure you will be fine. Its quite an enjoyable day actually. The day is over before you know it!
Its the 2 interviews I wasnt looking forward to. Just be yourself, concentrate on H+S and customer service and you will be fine.
Theres only so much you can prepare for really. Only a couple of questions each but they delve into your answers to find out more about you and also how you handled situations in previous jobs etc. All quite relaxed and dont feel as though they are trying to trip you up at all.
Best of luck for Feb