Hello Plee725,
It is a great idea to be mentally prepared. As a note, you can often visit the lab location the previous day, and often times the proctor will allow you view the lab room, so that you can get the stress of wondering what it will be like out of the way. Just go to the building, and ask the receptionist if the proctor will allow you to come back to the lab.
Good luck on your attempt!
Josh Finke CCIE #25707 (Voice)
jfinke@ine.com
Internetwork Expert
http://www.ine.com