Two. One to assume the ladder and one to change the bulb.
A': None. If the government would just leave it alone, it would screw itself in.
None, because people who glow in the dark don't need light bulbs.
Note: Topical to the Chernobyl Reactor disaster of 1984.
Five: one to handle the bulb and four to contemplate how David Sanborn would've done it.
Six. One to turn the bulb, one for support, and four to relate to the experience.