Plenty of this is homeowner-doable. Wipe down and lubricate the tracks, hinges, and rollers twice a year with a garage-door-specific lubricant, not WD-40, which attracts dust rather than repelling it. Check that the door reverses when it hits an object on the way down, that's a safety test, not optional. Look at the cables for fraying near the drum and bottom bracket.
What you shouldn't do yourself on a door from this era: touch the torsion spring. A wound spring on an older door can carry enough stored force to cause a serious injury if it's handled without the right bars and clamps, and the parts on a 1980-era setup are often not what current hardware stores stock, so even the replacement itself isn't a straightforward swap. If the door is sagging unevenly, or one side lifts before the other, that's a balance problem, not a lubrication problem, and it's not a DIY fix.