At the interview
Know the questions
Your job interview. You know the questions. Here are the answers.
Why do you want to work here?
It makes sense to tell them you admire the company and its culture and that you feel you would 'fit in' there. Also mention that you want to further your career and you see a long-term future at the company.
What's wrong with your present job?
Tell them you've really enjoyed your time in your present job but you feel ready to take on a new challenge. Never rubbish your present company and, least of all, your present boss.
What are your greatest strengths?
This is your chance to sell yourself, but try not to come across as arrogant. Use phrases like "My colleagues tell me..." or "I'm lucky enough to be...".
What are your greatest weaknesses?
You could say you don't think you have any, but that's probably not true. Better to turn the question into a positive - for example "I have been accused of being a bit of a perfectionist...".
Where do you see yourself in five years' time?
Try something like "Hopefully still here, having worked my way up to a more senior position". Or, if you're feeling bold, you could say "Sitting where you are". It flatters the interviewer and shows you're ambitious.
Mind your body language
You want to come across confident, not cocky. There's a fine balance between looking relaxed and slouching with an impression of arrogance. Here are some things you should definitely do:
Shake hands firmly but not so much that you break any fingers.
Smile as much as possible, especially when being asked a question.
Maintain eye contact with all the people interviewing you.
Hold your arms in a relaxed position rather than crossing them in front of you.
Sit up straight, slightly forward in your seat and try not to fidget.
Leave your nails, ears and hair alone as fiddling will show you are nervous.
Speak clearly, listen carefully and think before you answer.
Be yourself
Sometimes the most difficult thing to do is to act naturally. Try not to model yourself on what you think is your idea of the perfect candidate. If you try to be someone you're not, it'll show. Rather than worry about what you are going to say, just try to concentrate on what the interviewer is asking, don't interrupt them but if you aren't sure what they mean it's best to ask for clarification.
Accept a glass of water if it's offered or take a bottle with you in case your mouth becomes dry but don't accept hot drinks, especially if you are prone to clumsiness. The last thing you'd want is to spill a cup of scalding coffee into your interviewer's lap.