If the door is just sitting a quarter-inch off the track and hasn't come fully loose, you can sometimes walk it back by hand with the opener disconnected - that's a legitimate DIY fix and we won't pretend otherwise. What we won't recommend doing yourself is forcing a door back onto bent track, or working anywhere near a loaded extension spring, which is still common hardware on the older doors in this area. Extension springs store enough energy to cause real injury if they let go while you're wrestling with the track.
Our honest limit here: if the track is bent rather than just loose, bending it back rarely holds for long, and replacing that section of track is usually the better call than repeated field patches. We'll tell you straight if that's what you're looking at instead of charging you twice for the same fix.