There's real stuff an owner can do between visits: wipe down the tracks, check that the door reverses when it hits resistance, listen for grinding on the way up. None of that requires a tech.
What we don't recommend touching yourself is anything involving the torsion spring. On a door this old, the spring has already absorbed thousands of heat-driven expansion cycles from Tanque Verde summers, and a spring under that kind of fatigue doesn't fail gently - it lets go all at once, and it's under enough tension to break a bone or worse. If your door is groaning, dropping unevenly, or the opener strains audibly before it lifts, that's a spring or cable problem, not a lubrication problem. Save the DIY for what's actually safe: track dust, hinge squeaks, weatherstripping that's cracked from sun exposure. Leave the spring alone.