If you fold down the windshield, you will have access to the the reinforcement and could carefully nudge it out from the back side (actually, the front of the truck). The method they used to attach the pad is pretty simple.
I need to take my dash pad off so I can get to work on stripping the paint off the dash. I unscrewed the screws on the bottom, and I dont have any windshield knobs. After doing all of that it still wont budge. I dont want to force it since it is 24 years old and not a single crack in it.