"How to rehearse for a presentation" is addressed in this presentation tutorial video.
For more answers to your presentation design and public speaking questions, check out the Ethos3 blog: http://www.ethos3.com/blog/
Also, get additional presentation tips and tricks from Ethos3:
Ethos3 is a presentation design agency with premier presentation and PowerPoint designers. Contact us if you have an upcoming presentation. We can make your presentation awesome. 1-800-215-3692 http://www.ethos3.com