Sagging door hinge

Hi all, I need some advice on repairing my sagging drivers door. There was an explanation from .... Frank.. I think. To use a plank of wood under the door and sill and lever the door up. My question is do I loosen the door hinges first, otherwise how would it work..... Any body tried this please, my door is pretty bad. Thanks Cooky.
 
I managed to fit a washer between the lower hinge and the door itself, it worked well for a minor sag. I propped the door with a jack, it was a bit of a fiddle and I gave up on the top hinge. Instructions are here somewhere.
 
best off is going to the local scrappers and finding a 5 door and get the hinges off them ,
cause the 5 doors dont wear as much
or georgelikesmicras on youtube has something on doing the doors cut would say its only a temp fix
 
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