Hold a pen or mike cable etc. Use each overhead as a cue or prompt. Pause for water or a brief rest if you need to collect your thoughts, or for effect. STOP your presentation when instructed to by the timekeeper. The end You cannot overestimate how nervous you will be.
Good preparation is the best solution to nervousness.
The other is to learn when to pause for space. The objective, if you can achieve it, is to enjoy yourself. Your audience will respond to your fun. Practice 'muttering' when attending other people's presentations.