Don, it is fairly straightforward as the instructions say. I serviced mine several months ago. The front jack is a little tricky, just remove the outer plastic cover then the actual gear case cover. The only awkward part is the motor power wires pass through the gear case. You’ll see this when you get into it, not difficult. The two rear jacks are easy. Just remove the four gear case cover screws and lift off the cover. Push down on the square shaft that protrudes from the cover as you lift the cover. That will keep the gear in place. In case the intermediate gear stays in the cover, go slowly and turn the cover over slowly so as not to drop anything. You’ll see all this as you go. Don’t be afraid of it you can do it. I added more white grease to each jack. I didn’t think that initially there was enough there. Also, as suggested add some to the bearings. One of my jacks was fairly noisy so the extra grease really helped.