Get comfortable with the playback, or else

You have a shot of the plaintiff suffering, trying to be stoic, but failing. It will make your case.
You set it up with some irresistible figurative speech. The jury is hungry to suffer with your client.
You push the button and some color bars and 1000hz tone hits the jury.
You look down and you see you're not wearing any pants and the courtroom is flooding with a kind of Croatian liqueur that smells like sweat.
You wake up, vowing never to eat Margie's hot fudge before bed again.

Do you also vow to practice with your media presentation?

You should be comfortable enough to do a stellar job if everything works and an adequate job if it doesn't.

Presenting media in a courtroom is not a genetic trait. Everyone has to learn it. Even if you do well on standardized tests (that's how you got here, right?), you need to have someone who can run the equipment. Maybe that's you, maybe that's your second chair, maybe that's your hired help. Me, say.

Knowing that the video will play smoothly, look good on screen, stop and start when it needs to, this will let you relax and focus on being charismatic.