On the instructions it said that help was needed from an electrician to do self assembly of light bulb into the mouth of the lamp and this area needed tightening with specially supplied tool. Actually I did it myself slowly, and managed it ok without breaking anything, and I made sure I held the light bulb with something else to protect it from my fingers. They are adjustable in 4 strengths of brightness and can really dazzle or dim according to taste, all by touch!