How do I pickpocket an enemy?
Solution 1:
It doesn't have to be unlocked, but it will only work in certain cases.
Assuming you're using the Xbox pad, just get (really) close to him, stealthy, and press the B (instead of X) button to steal instead of kill him.
Also, note that some players had troubles with the stealing feature.
Solution 2:
Don't use "E" button. Instead use right mouse click. And once the animation begins with mouse (the show which way to pull it) once again pull it and right click it.