The main thing of course is to remember that you are working with a flammable material - no smoking, no sparks! Treat it as though you are working on the fuel system.
Unlike R12 or R134, Enviro-Safe is charged into the system as a liquid, with the can upside-down.
Electronic leak detectors (including those sold by Enviro-Safe!) will not detect it, unless they are specifically designed for hydrocarbons and most are not. You can use dye for leak detection - Enviro-Safe sells refrigerant containing the dye. Alternatively you can temporarily install the old type refrigerant for use with electronic detector.
Another thing to bear in mind is that once you use this "foreign" gas in your system, no garage will touch it, you are committing to servicing your own A/C.
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