When my spring failed it was one turn of the coil spring that shot across the garage and landed behind my road runner. If it had projected a few inches lower I'm sure I would have had damage to the car.YouTube
Honestly some really good info and videos
I did mine for the first a few years back , common sense goes along ways , take your time and patience
Menards had everything as far as hardware and springs
I didn’t even realize one of my springs had broken until I hit the garage door opener and the door wouldn’t come up . I found parts of the spring 40 feet away on the backside of garage . I said to myself what kind of damage would of happened if a car
Anyways , did I say take your time and common sense
BTW due to the Tucson garage door mafia I had to rent a car for almost three weeks. All my vehicles were hostage in the garage. Took two weeks of calling begging pleading showering money to get my spring replaced. Cost almost $900.
That's when I realized every single garage door business in Pima County Arizona is related by blood or marriage or Mafia ties.
Like I said don't get me started on garage door repair........