CITROENXM - ARE YOU SURE!? THIS ALL SOUNDS UNNECESSARILY COMPLICATED!!
I'd strongly advise not touching the manifold/front end panels, radiator etc etc.
ALTHOUGH YOU'RE CERTAINLY CORRECT TO RECOMMEND that It needs tackling
from underneath.
I'd be surprised if there was any under-tray etc blocking access. You can try
undoing the bolts from the top but only need the bonnet opened to undo the battery!!
The car needs secure support up no more than 12" at the front - the only real hassle
I encountered was actually jacking the car up - the front wheels dropped down as it
was jacked and I had to lift it a way to get my heavy duty car ramps underneath - no
big deal though, honest!
I've had an expensively reconditioned starter that kept failing and got to the stage
that I could swap over starters in about 30 minutes...
In reality anyone who can 'spanner' confidently should get the job done in no more
than an hour in total - obviously without stupid snags like rounded bolts etc. No
removal of anything barring the actual +ve battery, the wiring feeds and the heat
shield over the starter (if still fitted) is needed.
If you like, you can remove the upward facing accumulator sphere; and that's JUST
to access ONE of the more awkward allen headed bolts (this was on a manual
gearbox car that will likely be the same as yours anyway) - that's ONLY
IF they're REALLY tight and have NEVER been undone before. I was worried I'd
ruin the head and have to undertake more serious surgery to remove it...
It's actually a very compact lightish starter and not too difficult to manouver through
the available space.
Andrew