i had a horrible speach problem growing up, it took 7 years of intensive speach therapy to straighten it all out. when i was in high school i decided to make myself do things in order to boost my confidence when speaking to anyone. i tried out for a radio broadcasting team, before i tried out i practiced for weeks with the script and somehow i got on the team. i was in speaking events, plays and so on. if anyone ever told me that i couldn't do it, then i practiced harder just to show them i could. now i'm the president of a 600 member club and i have no problem speaking in front of them. when i do get nervous my speech problems tend to come up again. so...i have a few rules that i follow. these rules help me when i speak in public, i hope that these will help you too
1. SLOW DOWN and collect your thoughts
2. if there is a word that you am nervous about pronunciating correctly then think ahead and substitute it with another word
3. if you make a little speech bobble, just go on and act like nothing went wrong. the odds are that the person listening to you will never notice
4. BE CONFIDENT, when your speaking in front of a board don't look at your hands. i noticed that if i ever looked down and lost my thought then odds were i would start to make mistakes when i spoke
so these things help me out. just take deep breaths before you go in, and you'll do great!