Lookout Ruben, i managed to turn a half hour oil change into a three hour ordeal yesterday. Complete with the walk to the parts store and creating a major mess. I've only been changing my own oil for about 30 years too, but it was hard to tell I'd ever done that before.
On the plus side, I felt a lot better when I was done and heard the horrendous sounds of rod knock coming out of the mom mobile driving down the street. The lady driving that had gone the other way shortly, and was so concerned about the noise that she finished her cell phone call and was devoting all her attention to driving.