I was talking to some lawyers yesterday and was interested to learn that a good lawyer knows the first sentences of his plea by heart. this is exactly my advice for your presentation. I don’t learn my presentation by heart but I do know what my first sentences will be. For the rest I relie on the preparation I have done. I know my strcuture and I know the order of my slides. This gives me the confidence that I am on top of it. So please be an excellent lawyer and learn your first sentences. Before I go on stage I focus very much on the structure of the presentation, the big parts but some 2 minutes before I atually go on stage I focus very much on these first sentences.