Changing the cartridge is really easy. I have an Epson WorkForce 3540 because you had to turn on the printer, scan unit in an upright position so that the cartridges are visible in the bay, then the Printer Setup under Tourchscreen select the cartridge change. Then the carriage moves slightly to the left. Subtract from the cartridge protection glue, old raus, new a few times and shake installing. The result is as expected, really great.