Turn off the water supply and electrical breakers. Disconnect the drain and fill lines underneath the sink. Remove the dishwasher door by unscrewing the hinges and cutting the electrical cords. Unscrew the toe kick and remove.
Cut the electric lines connected to the back of the dishwasher and disconnect the drain and fill lines from the bottom of the machine. Leave the drain and fill lines, as well as the electrical wires, underneath the cabinet. If undamaged you can use the same connections with the new machine. Remove cabinet-mounting screws then slide the dishwasher out of place.