One thing I tend to do a lot is two-handed gestures when giving a talk, speech, or presentation. I somehow don’t know what to do with my hands, so I claspe them together, or wave them around, etc. But from watching other speakers – one handed gestures seem to be not only less distracting, but more effective. It is so much more obvious that you are making a point. I don’t know why this is, but perhaps ‘less is more.’
Simpler is Better. Only one hand is necessary, and more likely to get your audience to focus on your message. There’s a reason why pedestrian stop lights only have one hand to tell you now to walk.