A sponge!
or
Three. One to climb the ladder while the second kicks the ladder out from under her. And the third to say, "I knew that was too high for you dear."
or
Three: One to screw it in, and two to talk about how much better it is than with a man.
or
Two. One to screw it in, and one to stab the other in the back and take all the credit.
or
Address.
or