One but you should have seen the bulb it must have been THIS big.
Just one. He holds the bulb and the room spins.
By holding the bulb up to the socket and waiting for the world to revolve around them.
Two. The light bulb you remove and the light bulb you replace it with.
CHANGE!
Only one but it takes eight million years.
Two. One to change it and one to put some chips with it.
For the halibut
They both fiddle with a rod