I have a door. It fell down.
How can I rehang it by myself? More specifically, how can I hold it up, a few inches off the ground, while screwing in the hinges?
In addition to the tips mentioned there, I would just add a few:
Take three pieces of 1x4 about a foot long and ripped one piece a little larger than the width/depth of the door (about 1 1/2in). Then nailed them together to form a U shape with the ripped piece at the bottom of the U.
This setup gives some support to keep the door vertical while attaching to the frame.