If your house went up anywhere near 1985, the torsion spring on that door has likely never been swapped. Springs are rated for a number of open-close cycles, not years, but thirty-plus years of Arizona heat cycling steel expands and contracts that spring far more than the rating sheet ever accounted for. That's not a project for a ladder and a YouTube video. A torsion spring under full tension can put someone in the hospital, and the wrench sizes and winding bars this era of hardware takes aren't always what a big-box store stocks.
What you can safely check yourself: the photo-eye sensors near the floor, whether the track has visible dents, and whether the door is noticeably heavier on one side when you lift it by hand with the opener disconnected. If it's uneven, that's a spring problem, not an opener problem, and it's not a fix to attempt solo.