In the beginning
BE CAREFUL: If you are not sure about the electricity part it will be better to contact an electrician.
Betsy started with dismantling of the lamp.
She unscrewed the two little screws and took off the wires.
After that she pulled the wire out of the bottom of the lamp.
In every operation she took pictures to be able to assemble it. In the end of taking apart she separated the glass parts and placed all three glass portions on a bit of cardboard.