Ive done it many times without tearing the car apart. You have to be a bit more careful but it isnt that extensive of a process. Companies that do that are just ripping you off. Take thebdoors off sand blast them, reprime, paint the inner doors and outwr doors. Put them back on and cover them in plastic. Cover all glass with plastic as well and do the exact same thing to the rest of the car. I may bot ve professional with it but ive done it for cost of supplies and a case of beer. Not saying it always that easy really depends on the car but a mustang is not a difficult to paint vehicle.