I did the entire re-upholstery myself, except for the headliner, so it can be done by a hobbyist / novice with no experience. I am fairly pleased how mine turned out (IMHO). I purchased a complete TMI Sport 2 kit, which includes replacement foam, plus the carpet, side panels and door panels. The kit was pretty well made and went together nicely.
I went all the way down to bare metal and repainted the frames. There were hundreds and hundreds of rusty old hog rings to remove, so some high leverage bolt cutters is good advice (above). You'll need a heat gun, some silicone spray and a good set of hog ring pliers (straight, angled and curved). Be sure to save the old attachment rods, as these don't come in the kit and you'll need them. Once the foam is secured, stretching the vinyl over it for a snug fit can be hard work (sometimes for two people above). The old burlap from my car really stunk, so I used some adhesive-backed felt as a replacement. This worked pretty well, in that it self-stuck to the frame and provided a little additional padding.
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Good luck. This can be a very satisfying project if you take your time and work carefully.