GB wrote:
If the only way to get a decent result is to to the door off its hinges then
that's what I'll do. Trouble is that I find it's usually quite a battle to
rehang the door afterwards.

No idea about trimming in situ, however to get the door off, first use
a sharp knife to cut right through the paint around the hinges, then
open the door to 90 degrees. Get a thin board , push it under the door,
chock it up with a block to support the door. Unscrew the screws 'till
the countersunk portion of the head clears the hinge. Use the board
under as a lever to break the paint seal. Remove all screws but one in
the top hinge and one in the bottom. Support the door to stop it falling
over, an assistant is ideal, and remove the remaining screws. Rock the
door using the board to withdraw the hinges sideways:

Lining
-------o ----- hinge out this way
|####
|# Door
|####

Don't pull the hinge flatways out of the lining, else the timber will
"break out".

To re-fit, tidy up the paint at the edges of the hinges/housings, put
the door back on a piece of board, put a block of timber under the
board, use this as a lever, pressing on the end of the board, to get
the hinges to pop into their housings. N.B. *Find the threads* when
replacing the screws, don't just put the screws in and do them up.
If any screws were different sizes, you should have noted that on
removal, & replace appropriately.