AWKWARD ZOMBIE

Wasn't sure where to put this, so putting in general. I need some advice on how to fix my garage door. Yesterday, the big spring above the door broke. I can still get the door open if I lift while my wife pushes the button, but that door is dang heavy. click here Is that something I can fix myself, just replace the spring? If so, where do I get it, and how do I make sure I get the right one. Do any of the Home Improvement stores have a repair service? Do I have to replace the whole lift mechanism?
garage door replacement Chesapeake VA

Sorry if these are stupid questions, but haven't been able to get much info on my own. Stopped at local home store, but Garage guy had the day off.