A broken torsion spring is not a DIY repair, full stop, regardless of how new or old the door is. These springs are wound under enough tension to cause serious injury, and the hardware on a 2000s steel door isn't forgiving if you get the winding bars wrong.
A misaligned photo-eye sensor is a different story. If your door won't close and the opener light is blinking, check that both sensors near the floor are lined up and the lenses are clean - cold weather grime and condensation cause this more than people expect. That one's worth five minutes with a rag before you call anyone.
Where we draw the line: if the opener is original to a 2002-era house and the board has failed, replacing the board can cost close to replacing the whole unit once you add labor, and a new opener comes with a warranty the old board never will. We'll tell you honestly when repair isn't the better math.