Well here's the order I would suggest having done mine last year:
1) do any soundproofing you have planned
2) get all the wires in the right place
3) make sure you know where you are going with all your seat belts, but don't fit them yet
4) fit the headliner and any sail panel trims paying attention to where the seat belt mounts are (maybe chalk them on the h/l)
5) fit the front and rear window trims and the trims over the door opening
6) fit the carpet and the parcel shelf - this is a good time to make the holes you need in the carpet for the middle seat belt buckles as later you won't be able to feel around under the carpet
7) fit the back outer front seat belt anchors and the 1/4 panel trims together.
fit the door panel trims so you can make sure they don't hit the rear 1/4 trims when you shut the door.
9) fit the console (if you got one)
10) fit the rest of the seat belt anchors
11) fit the seats
12) sit on the seats and fit the rear view mirror, visors and courtesy light.
13) open the beer
- did I forget anything ?
Hey that's funny - the machine changed my number eight into a "cool" icon