I removed the old unit by unscrewing the bottom retaining screw and loosening the bracket bolts. I disconnected it and removed it, saved the shut off arm and cover plate as the new unit didn't have them. For my situation I had to replaced it while I had it plugged which is not what your supposed to do, so I turned the fridge knobs to off hoping to not make a short. The fridge is in a laundry room and a very tight spot, where I would have to remove the doors of the fridge as well as an entry door, so I cautiously opted to do it while plugged in. The entire process took about 20 min only because it was a little difficult to get to one of the bracket bolts with my large hands and arms. Easy DIY job and we have a full ice bin now!