be well-informed of
It is a Chinese idiom to describe how easy it is to do things.
explain
It's like playing around in the palm of your hand. It's very easy to do things.
source
Liezi Yang Zhu: "when Yang Zhu saw the king of Liang, he said that governing the world was like good luck."
be well-informed of
know one 's subordinates well enough to assign them jobs commensurate with their abilities - zhī rén shàn rèn