A torsion spring under tension is not a weekend project, full stop - that's true everywhere, not just here, but it's worth saying plainly. Where Fairforest's age matters is in troubleshooting before you call: if your door is from the 1980 era and the opener light blinks but the door won't move, check the manual release cord first. Sometimes it's been bumped, not broken.
What you can reasonably do yourself: lubricate rollers and hinges, check that the photo-eye sensors near the floor are clean and aligned, and tighten loose hardware on the track brackets. What you shouldn't: touch the torsion spring, adjust the opener's force settings past factory defaults, or try to re-tension cables. We'll also say this honestly - if a door from this era has a cracked wood-composite panel or rust through the bottom section, a repair quote can end up close to half of what replacement costs. At that point we'll tell you replacement is the better call, even though it's the bigger job.