Disconnect the garage door opener
Close the garage door fully
Clamp the door to the track to keep it from moving
Unplug the opener if needed
Identify the spring type: torsion or extension
Gather the correct replacement spring and proper tools
Release tension from the old spring carefully
Remove the old spring hardware
Install the new spring in the same orientation
Reassemble all brackets, cables, and related parts
Apply the correct tension to the new spring
Tighten all set screws and fasteners securely
Remove clamps and test the door manually
Adjust spring tension if the door does not stay balanced
Reconnect the opener
Test the door operation several times
Stop and call a professional if the spring system is damaged or unsafe