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(A) You, the speaker, are a visual aid. You are "on stage" the moment you are introduced. You can't pretend you're not there while you set up your demonstration or check out the podium, etc. That's one reason it's best to have things set up--and checked out--in advance, especially when the set-up is complicated.
(B) Talk while you do stuff. If you must set up a visual aid while you are delivering your talk, plan to talk about it while you're doing this, especially if this is a lengthy process. You need to keep control of the audience; don't let them drift away.
(C) Keep demonstrations or materials simple . Don't get yourself caught up running a three-ring circus. There will be too much for you to do; too much can go wrong, and you may trip over all your electrical cords (especially if they were not taped to the floor).
(D) Keep the visuals simple. If you are showing something on a screen, one idea per slide or overhead is about right. Avoid complicated slides/overheads. Don't show pictures of things you do not intend to explain. Lead your audience through diagrams, even if you think they are simple.
(E) Heighten interest. If you have a number of objects to display, reveal them one at a time. Don't show your audience all your tricks before you begin. When you're finished with an object, put it away. Don't play with it.