I did my own, took a couple of months. I was not in a rush, and yes, you have to cut all the pieces not sewn (seats, door panels). Got my leather and carpet from GAHH. Leather came with seat sewn, and door leather sewn, and 1/2 of cow hide rolled up. Carpets came ready to fit, and I must say they fit perfect. Door panels have to be glued to door panel boards. The hardest and longest job to do is to remove the old leather and carpeting, seats out and disassembled. I bought new seat pads too from MB, they were still available two years ago. DON'T replace seat leather without replacing pads, also check your seat springs. Anyway it is a time consuming process. If you want to try to do this yourself, please read my topic that I presented at Blacklick 2009, and if you have any questions, just contact me.
Bob