One common mistake/problem when re-installing a door is starting with the hinges too low on the body. Once you loosen all the bolts the hinge falls down to the bottom of it's travel. You can take a bottle jack and raise the door with the jack then tighten the bolts. This will get you up a little before you start trying to line up the door. Just be careful not to loosen all the bolts at once so it can't fall again. A door has so much adjustment you can actually "roll" the door. There are so many tricks with aligning doors it would be hard to type them all.
Jim