In poem "If" what are the obstacles the leader has to overcome to become a man?

According to the poem "If", there are many qualities one
must possess to become a leader.

-One must be able to keep
their "cool" even when everyone around them is "losing
it."

-One must trust in them self, even when doubted by
others.

-Be patient.

- Don't
lie, talk too educated, or concern ones self with
hatred.

-You must be able to dream and think, but do not
let either rule you.

-One must deal the same with failures
as successes.

-You can deal with defeat and begin
again.

-You will "go all in" with everything you have
because you believe in it.

-You believe in everything about
yourself, to the most minute thread of muscle and
tendon.

-You can talk with anyone- Kings and common
alike.

These are the things Kipling states one needs to be
a man.