If you have been to an Agile conference, training or similar situations that involve group activities you probably have heard something like:
now self-organize in 3 groups and ...
In this sentence there is the 1st prerequisite to self-organisation:
let people do it.
It start with a purpose, some work that needs to be done.
While it seems easy to let people do it, in some organization that can be a challenge [1].
[1]
Theory X management