Learn where the light switch, focus control and pointer are
located before your talk. Also give some thought to where you’ll
stand, because you’ll often be blocking the view of part of the
audience if you stand beside the projector; if that’s the case,
stand next to the screen and use a pointer. Make sure you’ve got
a table to set your transparencies and notes on, because you
won’t present a very dignified image if you’re down on your
hands and knees shuffling through your papers in the dark.