Garage door springs come in two styles.
How to install garage door spring.
Install the new spring reinstall the pulley and reconnect the safety cable and you re done.
Open the door to relieve the spring tension and secure it open with c clamps in the tracks.
A couple of carabiners can.
A pair of new springs cost about 25.
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.
Torsion see above which mounts on the header above the door and extension photo 1 which floats above the upper roller track.