I speak from experience here. It is not that tough of a job. The words transmission rebuild are a scary thing, but the C4 is not exactly the space shuttle. Get yourself the shop manual for the C4, a rebuild kit, and a set of bands, oh and grab a sector shaft seal too if your kit doesn't come with. I did mine over a weekend, and I am far from a mechanic. When I bought my bronco I couldn't even change my own oil, now I am just about finished rebuilding it from the ground up, including mechanical and paint, all done by myself. I made the decision when I bought the old girl that nobody works on my bronco but me, or somebody working with me. The C4 rebuild saved me around a thousand bucks by doing it myself, and the amazing feeling of accomplishment when you are done is awesome.