No matter what presentation structure you use or techniques you employ - nothing makes the difference to the quality of a presentation than how well you know your content.
It provides you credibility.
It gives you confidence.
It enhances your professional reputation.
It means you can answer tricky questions.
It helps calm your nerves.
It's the reason you are making a presentation in the first place.
I think it's kind of non-negotiable? What do you think?