I agree with doc j.
In order to fix your a/c system you will need several tools,,and here are just a few of them :
Manifold Guage Set,,Vacuum Pump,,Valve Core Tools,,Ultra-violet Flashlight,,Crimping Hose Tools,,Leak Detector,,Charging Scale,,etc,,etc,,
Just this short list of tools will set you back a few thousand dollars.
Oh and the most important thing you will need is an E.P.A. License,,without an epa license,,you cannot purchase or install any type of refrigerant gas.
Source: Snap On Tools