ok...time for a "stupid DIY'er" story.
My first house...many many moons ago, when I was just a lad, I had a garage door spring break. So I bought the replacements and proceeded to attempt to install them. I figured this would be simple enough as I have always been a pretty handy guy. Well...I took off the broken one...no problem. Then I started to take off the other side that was still tensioned. I had NO CLUE what was about to happen.
You all know where I am going with this, but when I put my wrench on the nut....started to loosen it....all I can say is I am VERY LUCKY I was not in front of it and off to the side.
The wrench was sent at about 150 mph to the back of my garage, went through the sheetrock, through the insulation and through the siding.
After realizing I had just about died, I found my wrench in the backyard.
I look back now and really am glad the internet is here now lol.
I did get the new springs installed, and tensioned properly, but only after talking to some people that knew how to do it.
Just wanted to share