This is so beautiful!  Note that it has 6 lights vs other similar styles that have 4 lights - it makes a difference in amount of light.  As others recommended, it's best to begin adding the crystals from the bottom to the top.  I am using this over a kitchen island and it is gorgeous.  It is easy to install - you will need a level to make sure that the lamp is level before adding the crystals.  I sat on a stool on the island to add the crystals.  Also, place a blanket or large towels in case you drop a crystal during installation.