I have found using a screen capture program to capture your presentation while your rehearsing is very useful, there are lots of free and open source ones out t

I have found using a screen capture program to capture your presentation while your rehearsing is very useful, there are lots of free and open source ones out there. You have your power point and you basically go through the slides, presenting to your screen capture program. after you can review the video and make changes accordingly. I have also noticed that the real presentation ends up being ~1 1/2 to 2 times as long as your rehearsed version.. this is probably because when i present i force myself to go slow and I always ask the audience to interrupt me when they have questions, therefore you get immediate feedback and you can change things up on the fly