I can't honestly remember how much it was, mine was done in one complete sheet (2 layers), fiddly & time consuming
but worth it over small strips in my book. I think it was a door pack, but really can't be certain.
Basically the rear of the sheet was scored into about 3-4 strips just on the backing (not cutting through the Dynamat)
horizontally. Then the little foam bungs that are between the crash bar & door skin were removed. The sheet was rolled
up starting at the top of the sheet downwards (so when unrolled it would have the writing the correct way up).
This roll was placed in the door cavity above the crash bar and help up in place, then it was very carefully un-rolled
with the bottom of the sheet being aided by gravity as it goes down behind the crash bar. When you are happy with the
location being correct against the inner side of the door skin (here comes the fiddly bit !!), you gently start to remove
the horzontal scored strips covering the adhesive backing. Oce the top one is off and the sheet is held in position, it will
get slightly easier removing the other strips. U can use a wooden spatula stirrer thing from the kitchen to press gently on
the back of the dynamat to get a good seal. It's nice & thin and has a flat end. Try not to get any air bubbles/pockets as
they will reduce the Dynamats effectiveness.
I would suggest you take off the door panel and have a feel inside the door cavity to give you an idea how big a sheet you will get inside in one peice without hitting any obstructions. Probably easier with a mate on the other side of the door
to help with a tape measure. Then see what Dynamat you will need. Like I said above I think it was 2 full Door Kits I used,
but better off checking for yourself to be on the safe side. Once done see what you feel the result is like, you may want to try second sheet on top, but that is up to you, one sheet may well be enough :)
Hope this helps :)
EDIT****
you may find it a little easier removing the woofer & spacer to allow you a bit more access inside the door cavity