Research the Company, and find out as much as possible through websites, directories and company literature.

Obtain a job description and make sure you measure up to the competencies and criteria set out in the brief

If necessary, make notes or rehearse examples in past or present employment that demonstrates your experience/Abilities to do the job in question. Do prepare for the interview! Make sure that if any documentation has been requested to be completed and bought with you then make sure it is!