I just put a clutch in our 82 bronco with a 300-6 and really I had no warning signs of the clutch going out. What happened was the all of the fingers on the pressure plate pretty much sheared off. I like to just say that the pressure plate exploded. The disc looked ok. Otherwise some signs are when you give it gas and the engine speeds up but the vehicle does not or the clutch slips, which would be the technical term. This can also be caused from a leaking rear main seal as well. When oil gets onto the clutch it slips until the oil burns off. Clutches aren't real difficult to put in if you have some mechanical knowledge and some good basic tools. You really do not need anything special. Just some wrenches and sockets and stuff like that. Your truck has a slave cylinder though and and those things are a pain to bleed. I do not know if you have to disconnect the line to put in a clutch. All you need is some patients and maybe get a freind to help. Some transmissions get heavy.