Beware of dust, which is poisonous; it is especially present when repairing brake systems, try not to inhale it. Firstplace the vehicle on the jackstands then start by releasing the parking brake handle. Detach the wheel and tire, but replace all four rear shoes at one time; do not mix brake assemblies as you're working on only one at a time. If the brake drum can not be removed easily then, ensure that the parking brake is off, spread some penetrating oil around the centre hub and retry after sometime. If it remains stuck, retract the brake shoes by removing the lanced cutout in the backing plate with hammer chisel then use small screw drivers to 'shove' the shoes away from the drum. If there is any crack, score mark, deep scratch or hard spot present which should be refined with an automobile fine emery cloth, then the drum should be taken to an automotive machine shop for turning or changed if it cannot be surfaced within the maximum diameter. The brake drum is then fitted back in place and if you are reusing the old brake drum, then ensure that it is fitted back in the same position that it was removed from, and the next step will be tightening of the wheel stud lock washers. Lastly, fit the wheel and the tyre, follow the manufacturer's recommendation on the degree of force to be applied to the lugs, then drop the car, and move forward and backward to adjust the brakes to deliver the right pedal action.