A torsion spring under tension can put someone in the hospital, and that doesn't change because the door is newer or the house is smaller. If your spring has snapped, don't wind it down yourself and don't try to open the door by hand past that point. Swapping rollers or tightening loose hardware on a door that still opens fine is reasonable DIY work. Spring replacement, cable work, and anything involving the torsion bar is not, regardless of what a video makes it look like. One honest limitation: if your opener is still under a manufacturer warranty tied to a specific board or logic unit, we may not be the right call for that repair - some of that work has to route back through the manufacturer, and we'll tell you plainly if that's the case rather than take the job anyway.