For doors with torsion springs located over the door spend the 50 or so to have a garage door professional release the tension.
How to install garage door with torsion spring installation.
Make sure that the bearing is inside the stationary cone.
Finger tighten nuts on bolts until the stationary cone is flush against the center bearing plate.
Just a video showing how to change out broken garage door torsion springs with new ones.
Insert the bolts in the stationary cones of the new torsion spring and insert the bolts in the slots on the spring anchor bracket.
Secure each spring with the set screws on the winding cone.
Part 1 of 2.