Turn off the power to the disposal. Set a bucket under the U-trap.
Loosen the slip nuts from both ends of that U-trap to remove it. Turn the slip nuts counterclockwise with a pipe wrench.
Pull the small hose that connects the disposal to the dishwasher off from the top of the disposal.
Unscrew any screws that may be holding the disposal to the bottom of the sink. Twist the body of the disposal left and down to remove it.
Remove the power cord from the disposal by pushing off the cord's cover on the bottom of the disposal. Unscrew the screws that hold the cord to the disposal.