Never underestimate the importance of a firm, confident handshake and positive body language. “I was once told by an employer that they turned down my candidate because he slouched in his chair. You have to look keen and engaged, so mirror the body language of the person interviewing you, lean in towards them at times and don’t cross your arms. Always accept a glass of water, it can create a useful barrier during an uncomfortable question and buy you a few crucial seconds while you take a sip.