The best way to practice a presentation or meeting is a dry run.
Dry runs take the guessing out of game day, and the give you safe opportunities to fail and learn.
If you’re running a meeting with multimedia, it’s best to do the dry run at the venue you’ll use.
Try not to schedule the dry run the day before. If you can give yourself the luxury of several days, that allows time to adjust and fix anything substantial prior to the actual meeting.
The second key is to have at least two other trusted hands in the room with you to provide feedback. Better yet, if they can try to throw you off your game with questions or curveballs.
Finally, if you’re using a presentation, take a hard copy with you to the dry run. Write notes on each page as you go. You won’t remember the verbal comments without it.