Preparation involves understanding the audience's familiarity with the topic. This helps in tailoring the speech appropriately. There is nothing wrong with over-preparation: prepare the speech in advance of the presentation to leave yourself sufficient time to practice. However, be prepared to work off-script, and show your enthusiasm and humanity to connect with the audience. Mingle with the audience members in advance of the presentation to overcome nervousness and establish a comfort level with your listeners.
Start a speech by outlining the contents, then fill in the details and close by recapping the main points. Do not clog up your speech with stats and facts. Instead, use a simple structure with three key points. Slide presentations should not be crammed with charts and graphs either: they should supplement the speech, not contain the entire text of the speech.
Do not use business or technical jargon, or assume that the audience knows the topic. The speech should flow effortlessly from one thought to the next, held together by examples and inspirational stories that will be remembered long after the speech is over. The listeners should be able to close their eyes and visualize the elements of your speech. If you are using humor, use the approach made famous by comedian Jerry Seinfeld in the sitcom "Seinfeld": weave funny and relevant everyday observations into your speech. (See Reference 1: Tips 1,8,16,24-26)
The style elements of the speech are just as important as the content and structure. Start slowly and let your listeners get used to you. Pauses prevent speakers from rushing their presentations. Maintain eye contact with all sections of the room. Try to deliver at least the introduction and the conclusion from memory. Move around on stage purposefully to draw in the audience. Thank your listeners at the end of the speech for their time and attention.
Be yourself. If you try to imitate somebody else, the audience will see through it. Do not take yourself too seriously, but take the preparation and practice aspects of the presentation seriously. Most importantly, advises two-time world boxing champion George Foreman, remember that a speech is not about you. Rather, it is about informing, helping and inspiring others.