It took two professionals 10+ hours to install. It had a very high degree of difficulty in that there was a plastic film installed on the disc with the hundreds of fine lines of crystals attached individually over the plastic film making it a hellish nightmare to remove. The individual 9 lights to install were extremely tight in their sockets making that difficult, as well, to ensure they were securely installed. However, overall the visual effect of the fixture once installed makes it worth the process and money. A truly stunning piece.