Using your hands while speaking should look natural. Let your hands do their thing as they do when you are talking to a friend.
You’ve seen many speakers who stand in one spot, behind a lectern bobbing their heads up and down to look at a script. Do we have to stand like a statue with no body or hand movement and very little facial expression when we speak? NO! Give ALL of you in your talk.
Let your hands follow your words. Let your face do what it does when you talk to your friends. Get excited. Show your passion. The audience will feel theirs at the same time.
Here’s another tip for what to do with your hands.