A torsion spring holds enough stored energy to break a bone or worse if it lets go while you're working on it, and that's not an exaggeration we use to sell a service call - it's why we won't talk a homeowner through doing it over the phone. Swapping a bottom seal or tightening hinge bolts, fine, that's reasonable weekend work. Replacing a spring, re-tensioning a cable, or setting a new opener's travel limits on a door that's out of balance is where DIY installs go wrong, and we've been called out to finish jobs that started that way. If you're set on doing the demo and framing prep yourself and having us handle the door, spring, and opener, say so when you call - we'll quote around that instead of assuming a full install.