The doors with two springs are easy to replace.
How to install garage door spring.
A couple of carabiners can.
Torsion see above which mounts on the header above the door and extension photo 1 which floats above the upper roller track.
Install the new spring reinstall the pulley and reconnect the safety cable and you re done.
Disconnect the spring from the track bracket and the spring pulley and disconnect the safety cable from one end.
There are two types of garage door springs.
A pair of new springs cost about 25.
Garage door springs come in two styles.