I took off the driver’s door and put it on sawhorses, which made it easier to sand it. I didn’t try to remove all the old paint, but I made sure to sand completely through the old repaint job, and well into the original paint. Fortunately the original paint is still quite good beneath the surface- there isn’t really any peeling, cracking, rust bubbles, etc. The only exception was the trunk lid, which I took completely down to the metal, and of course the places where I needed bare metal do do dent-pulling or welding. I have to spend maybe 10 or 15 solid hours with the sander do do the entire car. It’s just noisy, dusty, uncomfortable work…