Confidence

http://www.nlp-secrets.com/nlp-confidence.php

Adopt an open posture. No crossed legs or folded arms.
Make your neck tall and shoulders relaxed, as if you were trying to see over a wall that was very slightly taller than your eye level. Like a meerkat who is looking for a predator. You know what I mean.
Speak clearly and with volume, remember what you're saying is worth hearing.
Don't take yourself too seriously, humour is the most universal language and can help prevent conflict with alpha-male and attention-envy types.
Don't be judgemental to others - but let yourself be open to judgement from others. This relaxes people around you, and helps bring down the barriers between you.

http://www.theprovince.com/Speak+loudly+speak+clearly/3217061/story.html


Coming across as confident is often a result of two things -- body language and tone of voice. No doubt you already know about sitting up straight and making eye contact to show confidence, therefore I am going to focus on how your tone of voice can get you that next job.


Your tone of voice has a big effect on how people are going to both perceive you and respond to you. In fact, your tone of voice is more important than the words you choose; it says to people, "This is how I am really feeling."


-Practise speaking in a slightly lower octave; deeper voices have more credibility than higher-pitched voices.

-Pause before saying a meaningful word or idea you are sharing to emphasize its importance.

-Pronounce every word; don't mumble.

-Record your voice and listen to it.


http://cstudies.ubc.ca/academic-english-support-program/courses.html