Here are six axioms about arrangements that have been developed over years of hard lessons, learned from my own and others' painful experiences. They will serve you well if you apply them rigorously.
Remember that the medium may be the message. Marshall McLuhan's famous observation—slightly adapted—definitely applies to presentations. A smoothly run presentation not only helps get the message across—it also enhances the confidence listeners have in the speaker and the material. Conversely, speakers who have serious operational problems are doing serious damage to their cause. Observers may assume that such carelessness applies to the work being presented as well.
"If a presenter fumbles with the audio-visual equipment, ...