Keakar. I used to install garage doors for a living. It's ease as long as your opening is under 12x7. 12 foot wide by 7 foot tall. The doors smaller than that will have extension springs down both sides of the doors upper tracks. The larger opening doors have a torsion spring mounted over the door on the header. You have to wind that spring with winding bars. I've head numerous stories of fingers chopped off trying to wind springs with screw drivers....etc.
You basically put the door in the hole and then mount the tracks to the walls. Then open the door half way and then secure the upper tracks to the ceiling. Then open the door fully and clamp it in place. Then you stretch the springs with the supplied cable by hand, and tie it to the upper track.
Let me know if you have any other questions.
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