oh, thoughts whilst I remember:
-> When you cut the insulation to size, make sure you cut it so it fits inside the door card.
-> Easiest way to re-install is to put both parts of the clips on the door card, make sure your insulation is fitted correctly and then put the door-opening-handle through the door-card, attach the pull bar for it and simply push the door card home. Make sure the cables are in the correct places first.
-> Test fit a few times without the clips attached to the card!
:-)
James