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None of it is overly difficult. If your system has been open or uncharged for long replace the receiver-dryer or accumulator on some systems.
You need to learn what type of system your car has. My El Camino uses an expansion valve that cost a couple of bucks and needs to be changed along with the accumulator if the system is discharged. The expansion valve collects any crud and tends to get dirty with use. If the system is discharged, replace it while you are in there.
If you are just adding refrigerant to a running system, you really need some gauges to see the pressures. Read and watch the videos on how to use the gauges and how to disconnect them to not release a lot of refrigerant upon disconnect. Don't just dump more refrigerant in hoping that fixes the issue.
Do so reading and watching. Listen to the experts, ignore the idiots. Learn to tell the difference.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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