How would you remove the dash to install a CD player in a 1994 Ford Mustang?

First of all, I wouldn't remove the dash. The factory radio is removed using radio removal tools available at your local parts store. I would remove the radio and work through the opening to do whatever wiring you need to do. In fact, there may not be much wiring either. Your local parts store or car sterio store also has wiring harness conversion kits that will adapt the factory radio connectors right to your radio/CD player.