Information on heater core replacement procedure on 1994 Chevrolet 2500 Pickup

How much of the dash has to be removed to replace this heater core,I am looking for information on just this model truck

Asked by for the 1994 Chevrolet 2500 Pickup
After removing the instrument panel storage box, center lower air duct, blower motor, windsheild hinge pillar trim pads, lowering/or completely removing the steering column, only then can the entire instrument carrier panel be taken loose and rotated down and back to access the heater core. This is a big job, not one I would recommend doing in the driveway.
How much $ are we talking? It is a 1994 1/2ton GMC worth $5K on a good day!
ARE YOU KIDDING??? Is it really that tough?