Breath in, relax your face muscles, take five minutes to ready yourself before meeting the interviewer.
Create a Google Alert about the employer to keep informed.
Thank the interviewer(s) in person, by email or by post. Common courtesy, alongside politeness really helps in interviews.
Don't just go over your CV. An interview is a chance to present all of your qualities that a CV can't present.
Job Hunting Tips:
"Develop all the info that you will need in filling out a job application in advance. Even if you are supplying a CV, it is possible that you will also need to complete a standard application for the human resources department."
Some useful things would be:
A want to improve
Be a good team player as well as work on your own initiative
A background in a comparable position with at least 1 year experience