I would also have something prepared for the end of the interview...
The bit when they ask you if you have any questions or whether there is anything else you would like to say...
You could ask about training opportunities and progression within the role
Use the second part as a opportunity to sell yourself, say you are punctual, a good worker, enjoy working both within a team and independently.
I did some interviews last week and one candidate did not listen to the questions at all. Her answers were off at a tangent and rambling.
My top tips would be -
be punctual, arrive in time to visit the loo and comb your hair, check you haven't got lipstick on your teeth
If possible leave your coat with the receptionist, so you just have your bag to contend with
Take originals of all your qualification certificates and recent training certificates
Smile and seem genuinely interested in the position
If it is a panel interview, make sure you make eye contact with all members
At the end, smile, say thank you and leave the room with the minimum of fuss.
And finally, do your homework
Good luck :)