Some of this is fair game for a homeowner with basic tools. Tightening loose track bolts, replacing worn rollers on a door that still opens and closes smoothly, or swapping weatherstripping on the bottom panel - those are reasonable weekend jobs, and there's no reason to pay a truck to come out for them.
What we'd steer you away from is anything touching the torsion spring. On a door from the 1958-era stock common in South Amboy, the spring is often wound tighter than people expect for the door's age and weight, and the tools to wind or unwind it safely aren't something most garages have lying around. We've seen the injuries from winding bars slipping, and they're not minor.
Opener circuit boards and safety sensor alignment are the other place to be careful - a sensor that's out of alignment by a fraction of an inch can make a door reverse unpredictably, and that's not a call to troubleshoot by trial and error on a door protecting a car or, worse, a kid's bike path through the garage.