A garage door built after 2000 still has a torsion spring under the same amount of stored force as one from 1985 - the age of the house doesn't make the spring safer to work on. We'd tell any Cumings homeowner the same thing: sensor alignment, checking the track for debris, and lubricating hinges and rollers are fine to do yourself with the opener unplugged. Spring tension, cable replacement, and anything involving the torsion bar isn't a weekend project, regardless of how new the door looks.
Where DIY makes sense here is diagnosis, not repair. If the door reverses on the way down, check the two sensors at the bottom of the tracks for anything blocking the beam before you call anyone - that fixes more Cumings service calls than people expect, and it costs nothing. If the fix is actually the opener board or spring, that's a call to make, not a part to order off a shelf and install yourself.