How do I install A/C in a cost effective way in my truck that was born without it?

I have a 97 f150 with 100,000 miles on it, runs great. I moved to a hot climate and need to add a/c. I'm not a mechanic, but I try to do anything I can. I had someone talk about adding an universal evaporator under the dash and getting the compressor and everything hooked up without messing with the factory heating and all that. Just a patch job to get cold air. Is that a good idea? Is there somewhere I can find step by step procedures on this? Thanks for the help in advance.