There's a short list of things worth doing on your own on a door this age: lubricating rollers and hinges a few times a year, keeping the track clear of debris, and visually checking that the cables aren't frayed near the bottom bracket. None of that requires tools beyond a ladder and a can of the right lubricant, and on a door that's original to a mid-60s Buena Park build, a little maintenance now buys real time.
The one thing we'd ask you not to touch is the torsion spring. It's wound under enough tension to cause a serious injury if it slips while you're working on it, and on a door this old, the mounting hardware around it has had decades to corrode or loosen in ways that aren't obvious from the ground. That's a call, not a weekend project.
If the door is struggling to lift evenly, or the opener strains and reverses partway up, that's usually a spring or cable issue, not something a tightened bolt will fix. Worth a look before it fails completely rather than after.