just double checking, to make sure I am doing it right....the can I get from the store should attach to with nozzle? I think I know, but I feel better running it by yall

 

It will come with a hose and fitting that will only go on your low side coupling. And a gauge on the can. Follow directions carefully. BTW, pressure should exist in your system even if "low", and "freon" vented by handling the connectors can do harm to eyeballs. Wear protective googles. Don't stick your face down there trying to get a close look. I'm not trying to be difficult.

 

I have always had good luck with the DIY kits. Like Buzz said. It's not hard and don't sniff the R-134.
Hook up the hose, start the engine and turn on the a/c.
Directions are on the can.
My wife's car has a leak, common on Volvos. I have to refill her system once a month. I can't wait until that car is gone.