Most home centers don't carry all the replacement parts you'll need for garage door spring replacement, and most garage door service companies won't sell you springs. So you may have to order the parts online and wait for the shipment to arrive. Garagedoorpartsusa.com and stardoorparts.com are two online sources . First, inspect the condition of your cables and brackets. If you see any frayed strands on the cables or rust on the bottom brackets, replace them now before they fail. Bottom brackets cost about $15 per set. Premium-quality cables (listed as “7x19”) last much longer than economy cables and cost only about $4 more. So it's smart to buy the better cables for about $12 per set.
There are knobs or dials located somewhere on your garage door motor that you can use to adjust the limit settings. The exact location and resetting procedures will vary depending on the brand and model of garage door you have. Your owner’s manual should have more specific information on how to adjust your limits. You may need to experiment with a few adjustments before finally getting the correct setting. If you find that adjusting the limit settings isn’t working, it might be time to call a technician to come and help get your garage door to stay closed.

You can choose from three basic types of steel door: (1) steel only; (2) steel with insulation on the inside; and (3) steel on both sides with 1-3/8 to 2 in. of insulation. Other features that add to the cost are thicker insulation and windows, especially insulated windows. The do-it-yourself tensioning systems also add a little to the door’s cost. Be sure to specify exactly what you want.
The nucleus of any garage door system is its opener. Easily overlooked, garage door openers are highly complex pieces of equipment, often containing dozens of intricate parts that work simultaneously with one another to consistently raise and lower your door. You'll know that you're getting the best from Sears as it's the home to America's #1 Garage Door Opener Brand, Craftsman*.
When you hire a professional, the first thing they will do is turn off the power as a safety precaution.  They will then measure the existing door springs to make sure the new springs they order or have in stock fit accordingly.  With these new springs, they will unwind the existing springs and install the new ones in its place, tightening them with screws.  When tightened, the springs will be balanced, lubricated and the springs will be wound up.  Lastly, the door will be tested and the tracks will be lubricated to move efficiently.

Garage doors cause injury and property damage (including expensive damage to the door itself) in several different ways. The most common causes of injury from garage door systems include falling doors, pinch points, improperly adjusted opener force settings and safety eyes, attempts at do-it-yourself repair without the proper knowledge or tools, and uncontrolled release of spring tension (on extension spring systems).

I got these replacement cables for my beach house garage door after the originals rusted and broke. These are twice the diameter of the OEM cables, and fit the door perfectly. The larger cables give piece of mind for both supporting the door and providing safety cables for the extension springs. Came with all the necessary hardware, and the installation was easy with the doors blocked in the up position.

The winding and unwinding is done at a metal fitting, called a winding cone, attached to the outside end of the spring. You stick a winding bar into one of the four holes in the cone and use the bar as a lever to turn the cone. Once you've completed a quarter turn, insert the other bar into a different hole in the cone and let the bar lever against the closed garage door to hold the spring tension. This allows you to move the original bar to repeat the process, alternating the bars with each quarter-turn. It takes about 30 quarter-turns to fully tension a standard torsion spring. https://youtube.com/e/Z_eZc-kh40c
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