Not blowing cold air

A/C service is simpler than a lot of people make it out. All you really need to know is how to read gauges and what they read MEAN. You can see everything from them, including a restricted system or a bad compressor. If you buy R12, be VERY careful, as there are a LOT of substitutes on the market, including some PROPANE based refrigerants. No, I'm not kidding. Propane will cool in the system, but I don't think I have to tell you why NOT to use it. lol As along as you keep everything clean, use new O-rings everywhere and take your time, I think it's in your wheelhouse of skill to do. It's really not that hard.

Look at it this way. I made my living for a time doing A/C work. If I can do it, anybody can.