If the garage door is broken or damaged, it can affect the feeling of the entire house. It’s not only an inconvenience, but it can also make your entire house feel less sophisticated and less functional. If you happen to be trying to sell your house, this can seem like a major detraction. Even if you’re only having guests over, you may feel as though you’re doing less than putting your best foot forward by having a broken garage door. http://www.youtube.com/watch?v=Z_eZc-kh40c&app=desktop

Loosen the set screws while holding each spring with a winding bar. Position a sturdy ladder to the side of the springs, rather than working directly in front of them, for safety reasons. Put on eye protection and leather gloves. Push a winding bar into the bottom hole of the winding cone on the outside of 1 spring. Use a wrench to loosen the 2 set screws. Keep a firm grip on the bar as the the spring will expand powerfully as the screws are released. Repeat on the other side.[2]
Unlike torsion springs, replacing extension springs has long been given the "green light" for DIYers, primarily because you can complete the job without having to deal with spring tension. The general process is simple and safe: open the door to relieve the spring tension (and secure it open with C-clamps in the tracks); disconnect the spring from the track bracket and the spring pulley, and disconnect the safety cable from one end; install the new spring, reinstall the pulley, and reconnect the safety cable, and you're done.
The track is secured with these little brackets and they're adjustable. There's a slot that it rides in so you can unscrew it here and adjust it if you need to. And you're going to have to pay attention and look at it closely to make sure it's in the right spot, but it's not that tricky and you can do it. And usually one side is out of alignment so you can compare it to the other and then adjust it as needed. https://youtube.com/watch?feature=youtu.be&v=Z_eZc-kh40c
From a big-box store, basic garage door cables can run between $8 and $20, depending on the product. Your pro may charge you a different cost if they provide the cables. Your cables may not need to be replaced if they have simply come off the track, but broken cables will need to be completely removed and replaced. In either instance, the pros will need to secure or take down the door; unwind the springs; reset or replace the rollers, cables, and drums; and then wind the springs once more. For example, a pro could reset cables that have come off the track for $129.99. The average national cost for a garage door repair specialist is $80 - $110 per hour and the typical cost to replace a broken garage door cable is anywhere from $130 to $200.
In addition to the bodily risk involved, it’s simply not an easy task. There’s the possibility that you will not install it correctly. At worst, this creates the risk that the mechanism will fail at the wrong time and injure you or someone in your family. At best, this means it will malfunction, and you’ll have to call professionals to fix it. It will save time, money and potential heartache to simply call a professional to install your new door springs correctly the first time. 

No matter what kind of door you are installing, be very careful. The instructions that follow are merely guidelines. You should read your garage door manufacturer's instructions and owner's manual very carefully before attempting either type of installation. And if you're a do-it-yourself greenhorn, skip this project and hire an experienced professional. It may be more expensive, but garage door installation is on the higher scale of DIY difficulty.
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