I think it's doable but it won't be a piece of cake. The main engine side(condenser, compressor, drier, hoses) shouldn't be too bad but your truck may be missing the electrical connections for the refrigerant/temperature sensors and compressor engagement which could be a hassle. The evaporator, expansion valve, and buttons would also be a big hassle because you would have to take apart your dash. You could get most of the parts from a wrecked truck. AC requires some unique tools: gauges, vacuum pump, and ideally a sniffer and nitrogen tank. I would rather buy a new truck but I just replaced a good chunk of system a few weeks ago so maybe I'm cheap too...
