A garage door cable that's snapped is under spring tension even when it looks slack, and on a torsion-drum system - which is what most Silver Firs houses have, given the 1997 median build year - the drum itself is still loaded even with the cable gone. Unwinding that drum without the right winding bars is how people lose fingers, not an exaggeration, an actual way this goes wrong every year. If the door is stuck halfway open or closed with a cable hanging loose, leave it. Don't try to force the door by hand and don't disconnect the opener and yank on it. What you can safely do: unplug the opener at the wall so nobody tries the button while you're waiting, and keep the car in the driveway rather than trying to squeeze it out. That's the limit of what's worth doing yourself here.