Yeah, just did it on my vehicle. It's real easy, takes about 10 minutes. The canister thing is $25 though. I don't know a thing about cars or engines and I had no problems.
I watched a Messican spray himself in the face with refrigerant messing with his car in a Chipotle parking lot //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif He was mad
its easy. locate the low side pressure line usually in front above the radiator. usually has a green cap with a L on it. check to see how much is in there 1st. that way you dont overcharge it and seize the compressor. what year make an model is it??? once you find the line get the kit with a gauge on the hose. see where the pressure is and refill it according to the level it needs. car on ac on max. hold the can upside down shaking it a little bit to let it get in there. after that you should be blowin cold air. i dunno if you did this already but hope that helps if you havent done it yet