Putting doors back on, any tips?

Hinges attached to the body, or to the doors?
Fenders are off.
I need to put them back on to help keep the body straight while I pull the torsion support and frame rails out, not worried about getting them exactly right (as well as some bracing welded in). I have the paint to go by to get them exactly where the were, the gaps looked good there. Just looking for any tips to actually get the bolts back in, lol. Floor jack and 2x4 under the door maybe? Probably be doing this by myself.
I built a door jack. Its a cradle of sorts on casters and a crank to raise and lower the arms. No helper required.