Because the drive couple was so worn, part of the rubber disintegrated while I was trying to remove it. This made it very challenging to get purchase on the old part and it actually took my husband and myself over 30 minutes to finally wrench it free. Once the old part was removed, the replacement was a cinch. Overall, it was partially frustrating and partially rewarding (to have repaired the blender with a $5 part was great). I was definitely appreciative of the video demonstrating the repair, because it showed us we were on the right track.