Well generally you can do it on your own but not in all cases. If you live in an apartment or complex you need to use the assistance of a professional to make sure that your AC is placed in safely and doesn’t fall off. Furthermore, getting the assistance of a professional will ensure that you have the right setup and even ensure that the measurements are right. Besides this, you need to consider that lifting an AC unit can be heavy and you will require assistance in doing this. This is why it would be a better idea to request an installation. Which in most cases is offered free of charge along with the device.