Here is another place that sells the pre molded carpet.
http://www.auto-interior.com/
I got mine from the place you posted and it is a nice grade although I suggest upgrading to the premium version. Install is pretty staright forward. Gut interior and I would suggest adding some sound deadner since you have it all out anyway. You can get fatmat from
http://fatmat.com the 50 Sq. Ft. kit should be good. Once you get that done lay the new carpet in the vehicle and arrange it so it is in place. Then once you have it where you want it use a very shapr razor blade and cut a X over all the bolt holes for seats seatbelts and anything else that needs to be done. Take your time and it will come out nice.
Richard