I own a car with this exact dash. It's laborious but not hard
1) Disconnect the battery. You MUST do this.
2) Remove all bezels (except glove box door), gauges, speedo (lower the column first), radio, clock, glove box liner. Be careful with the clock knob - you have to use a small jeweller's flathead to get it off. If the car does not have AC, the temp and heat/defrost lever knobs have to be removed - they use allen keys. Be careful removing the harness connectors to the rear of the speedo , as one can easily break the circuit board pins. Label your connections as you remove them.
3) Remove the heater and defrost ducting, and possibly the defrost vents (can't remember).
4) Remove the radio speaker and grille. The studs for the speaker grille go through the dash pad.
5) Remove the rear dash pad fasteners. The rear of the pad has studs and is held on by nuts. You'll need to carefully move the wiring harness around to access them. This is why the battery needs to be disconnected, as you can easily ground out a live wire.
6) Remove the front dash pad fasteners. The edge of the pad facing the driver has spring clips. Do NOT pry up the pad to pull them out, as they can rip out of the pad, ruining it. Instead, use a pair of pliers to squeeze them under the dash and push them up through the dash metal.
OK, I think this covers it. Good luck!