It’s pretty easy. Remove the brake drum. Remove the four nuts that hold the retainer plate to the axle housing flange. Slide the brake drum back over the wheel studs with the open end out. Loosely install some of the lug nuts onto the wheel studs, flat side towards the drum. Now use the drum as a slide hammer to pop the axle shaft out. Now is probably a good time to change the axle grease seals also.