One of the best thing that I learned is I don't have to take control of everything or to be more clear I don't have to do everything by my self:
Firstly, if it's not related to my main job I have to let the person in charge do it.
Secondly I have also to delegate tasks faithing in them that they well do it.
In the dictionary you can find the below synonyms of delegate:
Entrust,
Assign,
Transfer
Thus, you have to trust others, to assign them tasks and of course to transfert to them your knowledge.
Better you will do it, faster your productivity will be.