Will it be rock-hard to fix my garage door? We need to replace the spring on the side, since it cracked...

We need to replace the spring on the side, since it cracked rather, and brought down the pully to open the door next to. Can I replace it on my own (kind of handy at these things)? What is that spring called?
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Answers:    no it will not be to concrete. They are called extension springs. The color on one of the ends is the consignment code for the spring. Replace both springs! Those spring you will need the door begin to replace. Replace both and see how door feels. If fatty add stretch to spring by tightening cable. If it wants to fly up steal away stretch by loosing cables. You will want to do all adjustment with door amenable. Yes you can do it yourself but be careful! Its more expensive but I'd return with a pro out and see if you can convert to a torsion spring system. They are more efficient and safer if spring breaks. But to do that you really necessitate to consult a professional.
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Its called a garage door stiffness spring.It should have a color painted on the shutting.The paint code tells you what bulk the spring can handle.They are confident to replace.Just measure to cable that's not broke and put the clean spring on the other side in equal location as the good spring.