Turn up early and don't be the first in the clocking out queue.
Keep your hands out of your pockets.
Don't rush any given tasks, concentrate on doing them well, speed will come with experience.
Don't be scared to ask questions. Especially if unsure of something, better to ask twice than balls something up.
Keep your work area neat and tidy, pick up a brush if things get quiet.
Keep your fingers out of spinny things.
Make sure to add an extra teabag for the pot.
Sounds like a great opportunity, try to enjoy the experience and best of luck, hope it works out for you.