How can you be successful as public speaker?

The way you appear counts a lot, public speaking is directly related to self confidence,  which doesn't come just by pressing a button 😉 
So, how can a person raise his self confidence,  and what are criteria that one should respect when facing an audience,  to give the impression that they are confident? Comment on his physical appearance,  body language,  way of speaking 
(Il n'y a pas encore de discussion dans ce forum)