Many people forget how dangerous garage doors can be. Especialy when trying to release the springs.
I almost lost a finger many years ago when I forgot how heavy the door was without the springs conected.
If you are going to do this work, make sure you raise the door up (about 4 feet), then prop it so the door can't come down before you release anything. The springs should relax enough to work on them.
When in doubt, hire someone.
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