A homeowner can swap weatherstrip, replace a bottom seal, or lubricate track and rollers without calling anyone. Those are real fixes and worth doing before you spend on a new door.
What you shouldn't do yourself is anything involving the torsion spring or the cable under tension - that's true on any door, any town, but it matters more here because doors from the early 1980s often carry the original spring, which has had four decades to fatigue past its rated cycle count. A spring that old can fail without warning, and it's under enough force to cause a real injury.
Measuring your own opening for a new door is fine as a starting point, but the header clearance and track path on a house from this build era sometimes don't match current standard hardware without adjustment. We'd rather remeasure on site than have you order a door that doesn't clear the header.