Only one. Just as long as you hand him the damn lightbulb.
2 . One to screw it in and another to say, "I could do that".
I don't know, Vigo and see. (best read in Yanosh's voice)
One. They just hold the bulb in place and the world revolves around them.
5/3. The same amount as for whites.
Aren't their hands clammy enough as it is...