Practice, practice, practice! - You should know your presentation backwards and forwards before giving it.
Breathe In, Not Out - When you feel the temptation to ummm your way through a point, breathe in.
Avoid them in Conversation
Get a Counter - If your giving an important speech, get a friend to count the amount of times you utter an um or ah.
Underline key words and phrases and double underline especially important ones.
If Your Lost, Don`t Panic!
Instead take a quick pause before moving on. The audience won`t notice and it will make your presentation smooth.
Bonus Tip - Join Toastmasters
clipped from: www.lifehack.org