He does not recommend you repair all garage door springs. The garage door has a generic set of springs to use for the garage door he uses. The guy ordered the replacement link online and was sent a list of directions. The instructions included are really good and easy to follow. The best place to start is from the top of the garage door. How you determine what is not working properly is a challenge. If you notice any tension in either spring, it must not be allowed to move freely. The cables will be running down the doors. Strings inside could be broken or one broken. If the other one is working, you will need to follow the specific directions in order to take out the spring. There will be plenty of tension on the springs. This makes it much easier to pull the springs off even if they are not in tension. Two bolts are on the brackets that are in the middle. To give the spring enough to allow for clearance, you need to pull out a pin along the length. For more information, please take a look at this. ywds41igi5.