It can be done by yourself, but be sensible about it and don't rush yourself.
How I do it:
Clean the door and jamb thoroughly, then outline the hinge as closely as possible with masking tape.
Then wrap tape around all the door and jamb edges to help prevent contact/chipping the paint.
Roll the window down and wrap the door in a heavy blanket.
Then wrap a nylon tow strap or sling strap around it a couple times, with the loops "up".
Use your engine hoist to lift the door- just take the weight off it for now.
Loosen the bolts holding the hinges to the door, checking the weight and balance of the door in your hoist/sling. Remove the bolts when you feel comfortable with the balance and the weight on the hoist. Roll the door over to the corner or wherever you're going to store it, leaving it wrapped up for protection, set it on a couple of blocks and not directly on the concrete floor.
Repeat procedure for the other side.
Make sure all hinges are marked as to their original location on the car (Dr. side upper, pass. lower, etc.) and unbolt them from the jamb.
Rebuild or send them to Leo.
Reinstall hinges in their original locations, using your tape outlines to position them on the jambs and then the doors. It may not be perfect, but it gets you DARN close, needing just a few little finessing adjustments.
I usually work by myself, and use the same basic method for everything from doors to hoods and trunk lids.