Avoid delays from booting your computer at the start of the presentation.
Some computers require that the projector be attached for the video port to be activated.
Use a computer that is able to detect a video display without requiring a reboot. The ideal scenario would be to load the presentation software and open the slide show prior to the presentation. Know how to activate your computer's video port. Do not plan to power your computer with the battery. There will be no remote control, so plan on running the keyboard yourself.