If your opener is just squeaking, a shot of the right lubricant on the rail and chain or belt can buy you time, and that part's reasonable to do yourself. Where we'd stop you is anything involving the torsion spring system, the opener's travel limits, or the safety-reversal sensors - those have to be set to the specific door and track, and getting them wrong on a 1997-era door with its original hardware can mean a door that doesn't stop when it should. We also won't tell you a repair makes sense when an opener this old has already shown a failing motor or board; at that point parts for some older models are hard to source quickly, and a new unit costs less over time than chasing parts for one that's done. If you're not sure which situation you're in, that's a reasonable thing to ask about before you buy anything.