Is an HVAC license required for DIY home owner AC installation in the State of Georgia?
The type of unit called a "package unit", where the condenser and air-handler are combined into a single outdoor unit comes from the factory already charged.

That solves the refrigerant side of the equation.  Don't actually know if that is sufficient in Georgia or not.

Some un-named individual who lives in my house in NC installed one of these and, so far at least, has gotten away with it.