Disconnect the garage door opener
Close the garage door fully
Clamp the door in place to prevent movement
Unplug the opener
Release tension from the spring system
Use the correct winding bars for torsion springs
Remove the old torsion spring or extension spring
Install the new spring of the exact same size and type
Reassemble all hardware and brackets
Wind the torsion spring to the proper tension
Remove clamps and test the door balance manually
Reconnect the opener
Test the door operation
Stop immediately if the door is unbalanced or unsafe
Hire a professional if you are unsure or if the spring is under high tension