The doors with two springs are easy to replace.
How to install a garage door side spring.
A couple of carabiners can.
Unplug the garage door opener and clamp the door to the track.
This tension makes it easier to lift the garage door from its closed position.
Side mounted springs are long heavy springs mounted on each side of the upper garage door track.
The springs extend along the shaft and work by twisting as the garage door closes by means of cables attached to each side of the lowest garage door panel.
Use locking pliers or a c clamp to secure the door to the track to keep it from opening when you release the tension on the springs.