Please, for the love of whatever you hold holy/dear/important, learn how to speak as though you know your subject before giving a presentation on that subject! Contrast these two examples and consider for a moment which one best describes your presentations.
My apologies. The second presenter was unable to finish the presentation because I took a baseball bat to their forehead! No, not really; however, don’t think that thought wasn’t coming close to reality. I was this (fingertips forced together so hard they almost fuse) close to getting the equipment room key from the baseball team coach so I could get a variety of bats.
If you want people listening to you believe you know what you’re talking about, try talking about it as though you do know. A bazillion “like,” “you know,” and, worst of all, “um” fillers in the speech renders the speech useless. After about two minutes of that drivel, I find myself wondering what, if any, point there is to this seemingly random set of sound waves.
If your presentations are like Example One, good on you! Thank you! Please, please, for the love of Heaven, come over here and give the next presentation I must attend. I will gladly give up my weekends and next vacation week to be your unpaid guide, chauffer, and translator.
If your presentations are like Examnple Two, you are too stupid to live.
Bonus Rant: If you deliver the filler-ridden “speech” in a flat monotone, you are Evil Incarnate.