hi jackie
it might be better if a mod moved YOUR post/question to a thread of it's own...
something like DOOR ALIGNMENT/FITTING 101 or "my door fits like old socks" or some such thing.
_________
pulling the door OFF at the hinges is not a simple task OR 1 that should be attempted without prior knowledge...
and it will require cutting HOLES on the inner skin, or pulling rivets and LIFTING SKIN.
and none of that is likely to solve the issue anyway.
_________
the doors and FRAME are built as ONE UNIT in a jig.
imo there are far too many doors with CRAPPY fit and the odd gaps you've noticed.
but typically the only adjustments are done at the latch and lock and POST...
except for adding shims (which many think is a bad idea) there isn't much that can be done at the hinge...
except to screw it up...
and most dealers have not clue 1 about real door adjustment issues beyond lubing the striker and lock bits.
often the GAPS are made better or worse with the stabilizer jacks or tire blocks when parking.
_________
try searching HERE using the term "d.o.o.r." in the TITLE field only (omit the DOTS)
100s of threads will pop up but many of them are exactly on point and will help.
quickly scanning the titles one will see several that are exactly on topic.
cheers
2air'