thanks for the suggestions mates... but a/c tools particularly for freon charging are the only ones i dont have... i do have complete set of pneumatic tools, chain block, hydro press and torque wrenches, and special tools like ball joint separator/remover, P/S repair, stud remover/extractor, bearing/seal race, tap and die, pullers of diff sizes and others... recently, i acquired engine and A/T testers, timing light and ecu scanner and other mechanic's stuffs.
actually, I am the one doing engine, underchassis and other mechanical maintenance of our cars, including the cleaning of aircon system (evap, condenser etc...) since i already have almost all of the tools needed for a small car shop, i find it practical to invest as well with a/c tools as we simply send our units to a/c shop for charging 3 times a year (that is for annual A/C cleaning and maintenance of our 3 cars alone).....
its true and i agree that a/c maintenance is not an easy task. however, with my little knowledge in a/c repair as well as my technical background in electronics and electrical and, more importantly, the advice and help from you guys

, i dont think it would be impossible to do...
cheers and regards,
phezthie