This is something that a person with mechanical aptitudes can successfully install, with help from online videos. The one thing that was not explained was how to properly vacuum purge the system. = make sure all high and low pressure "hex" shut offs are turned on at the supply and return lines where the copper lines attach to the compressor ( outside unit) before opening the main (upper) shut offs to pressurized the system, otherwise you are not purging the A/C compressor circuit