Installing new Head Unit

If anyone can help me, it'd be wonderful. I'm trying to install my new head unit. It have it all wired and ready to be put in. I can't figure out how to get the darn dash off. It goes all the way from the vents down to the ashtray. I have the top part off, but it won't budge around the ashtray! Someone, please help me

http://www.hmaservice.com/webtech/default.asp
put in your vehicle at the top and click on the tabs and theres interior stuff in there that says how to take it off.