This was a very easy fix. Just like the video illustrated and the instructions which came with the part indicated. Smart design by KitchenAid. The coupling fails rather than some other part that is more expensive and difficult to replace, such as a motor shaft. The part is a soft aluminum hub with a rubber drive coupler. Just use a screwdriver to pry the coupler off. The aluminum will pull free from the steel shaft with not damage to the shaft. Then thread on the new part and you are done. Couple cautions. When the aluminum hub comes free, it will leave aluminum shaving on the shaft and in the steel threads. Clean these out carefully, I used a small wire brush and a sharp pick to remove them. Also, the housing for the blender is plastic. When you pry against it with the screwdriver, the shank of the screwdriver will mark up and dent the soft plastic. Cover the plastic with a layer of masking tape and wrap the shank of the screwdriver with tape. This is minimize and potential damage.
Overall, a very quick, easy repair.