Open door, remove the roll pin in the door check strap. Then remove the inner trim panel, inside you need to unclip all the electrical connections (windows, c/locking) and pull them out of the door from near the hinge. Then undo the hinge pins, these are bolts that go through the hinge blocks, top one undoes from below, bottom one from above. Then lift the whole door up off the hinges. Last time I took one off was at a scrap yard, it was perched on top of an Uno.
If you want to then remove the hinge blocks these are bolted to the door and to the A pillar