Please, I beg you, before you open your mouth, just do these 5 things, and item 1 twice for good measure.
1. Know your audience.
2. Do not show technology. Show solutions. Problems solved. Efficiencies. Not bells and whistles.
3. Share stories, perspective, your own view on items. Not features.
4. Don't fill empty air space with extra words. ("You know", "if you will", etc.)
5. Please practice, learn, read, watch others. If we were all born with natural speaking abilities, there would be no need for caffeinated beverages.
*Start with any book on speaking by Joey Asher but "Even a Geek Can Speak" has all of the answers and changed my life. Really. Unfortunately, no one is paying me to say this. But Joey, we can talk.