Swapping a remote battery or reprogramming a keypad is fair to do yourself, and we'd rather you not pay a truck fee for that. Where it gets risky is the drive mechanism itself - on a chain-drive opener from this era, the sprocket and motor coupling are often worn together, and replacing one without checking the other just moves the failure a few months down the road.
We don't recommend homeowners open the opener's logic board housing or touch the high-voltage side of the motor; on units old enough to be original to a Millington-area house, the capacitor can hold a charge after power is cut. That's not a job to learn on your own garage.
If the opener is newer and the fix is a worn sensor wire or a misaligned safety eye, that's reasonable to tackle with the manual in hand. If you're not sure which kind of problem you've got, that's what the call is for.