Tips for first shift on Tills

It's festive season! I'm a night colleague and I thought to myself; "Hey, what could I do to spice up my week?" So I've booked a shift on checkouts from 18:00 to 22:00.

Are there any tips or anything important to know/remember? I'm worried I might get too stressed out. (I've had so many Think 25 training videos it's permanently in my brain.)

Any advice will be appreciated!