For doors with torsion springs located over the door spend the 50 or so to have a garage door professional release the tension.
Single spring garage door installation.
Insert the bolts in the stationary cones of the new torsion spring and insert the bolts in the slots on the spring anchor bracket.
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Preventing garage door damage whenever a torsion spring is installed it is stretched horizontally along the shaft to keep the coils from binding.
Make sure that the bearing is inside the stationary cone.
Many garage door servicemen mark the springs with chalk or paint but you can probably wind the springs in the time it would take me to explain how to read the marks.
You will be winding up on the torsion spring.
At this point you will wind the springs.
Finger tighten nuts on bolts until the stationary cone is flush against the center bearing plate.
After your new door is installed remove the old stop material on the outside of the door and replace it with the type that has a rubber weatherstrip gasket available at home centers.
This home depot guide will explain the cost to install garage doors and openers or replace existing ones so you can decide which options are best for your budget.
A c hook is required for a single spring installation while a w hook is required for a double spring installation available separately.
Begin by turning the spring up 1 4 turn until it meets resistance.