now i'm not saying this is the right way to do it but this is how i do it.
take out the front seats, leaving the brackets on the cross-member
the car should have big thick foam pads at either end of the toe board (you know the bit i mean). these are held in with clips. leave these on (nice and tight) and then clue the carpet pieces to these using impact adhesive (don't use too much) then place the toe board piece in this should just sit there but may need trimming in places.
then move to the cross-member, whether you have a full width piece or two end sections, just stick these on with impact adhesive (not too much). for the full width piece you will need to trim it around the seat brackets, dont fit the brackets over the carpet !!!!
then glue on the inner sill pieces (not too much glue) remembering to trim a hole for the seat belt mount if necessary.
now you can trim around the door opening with a sharp knife, i leave the carpet right up to the edge of the metal and tuck it under the door seal (wait till the glue is dry first)
how you have the two main floor pieces left, these just sit in place but you may need to do some trimming around the hand brake, seat-belt mounts and gear lever.
i find that a roll if felt sound insulation under the carpet is good for cutting down noise, just cut some pieces using the carpet as a template but make the edges a bit smaller (dont put this under the glued bits)
if you have a rear parcel self carpet in the set then you need to take the back seat out to put this in.
(two screws in the boot and two behind the rear cushion)
this is a good chance to put two more bits of sound proofing under the seat, one under the cushion and one behind the back rest (weave it through the three suport bars of the seat back)
how refit the seats, sit inside, close the doors and get high on the smell
