A torsion spring holds enough stored tension to break bones or worse if it lets go while you're working on it, and that risk doesn't change because the house is a Saginaw house instead of anywhere else. We're not going to walk you through winding one. What you can safely check yourself: the track for dents or gaps where the roller rides, the cables for fraying near the bottom bracket, and whether the door reverses when it hits an object (federal auto-reverse rules apply here same as anywhere, and a door that doesn't reverse is a real safety failure, not a minor annoyance). If your opener is original to a 1999 build, replacing the logic board yourself usually costs more in parts than a full opener swap costs installed, since compatible boards for that generation are getting harder to source. That's the honest limit of DIY on a house this age - past the visual check, the parts worth touching aren't the ones worth touching alone.