A torsion spring under tension can break a hand or worse if you loosen the wrong bolt, and that risk doesn't change because your house is newer. What does change with a 1988-era door is that the torsion hardware is more standardized than what you'd find on an older converted one-car setup, and that leads some homeowners to assume it's simpler to handle themselves. It isn't - the spring is still wound to lift a door that weighs more than most people expect. One honest limit on our end: we don't stock every spring length and wire gauge on the truck, and a less common size for an oversized two-car door sometimes has to be ordered rather than installed on the spot. That's not an argument for or against doing it yourself, it's just the truth about parts availability. If the door won't move at all, or the spring coil has visibly separated, that's a call-in job, not a weekend project, regardless of how new the garage looks.