That's what the warnings are when you look at the site for replacing the torsion springs on the garage door. However, after doing the research, (see video on youtube.com for details), I determined that I was going to go for it. All went well, until it was time to open the garage door. Then I noticed that one of the wires that raises the garage door was not on track. This became a "two man" job. Mom didn't want to be the "second man", so a few phone calls later, I found one of the neighborhood teenagers who could come over and help me. I think he was here for all of two minutes. After that, a few more adjustments to the tension... and the garage door opens once again.