Breath deeply, relax your face muscles, take the time to pause before going in.
Thank the interviewer(s) in person, by email or by post. Common courtesy and politeness goes far in interviewing.
Ensure that your recent linkedin posts are work-friendly.
Review common interview questions and prepare your responses. Quiz yourself in advance with some practice questions.
Don't be afraid to admit you don't know the answer to a question. It's better than faking.
Dress for success. Dress stylish and precise.
Don't simply recap your CV. Use this chance to demonstrate all your qualities that a CV cannot show.
Job Hunting Tips:
"Your CV will not earn the gig on its own. Its 'job' is to earn an interview. Make sure your CV will arouse the employers’ attention so that you can get the first interview - and then that is where you can earn the job."