Every One can be their Own Shaman
But
Not Every One can be Some Ones Shaman
The Shaman is a Healer, a Sage, a Guide and a Mentor. They have one foot in every reality while never truly belonging in any.
Anyone can be their own Shaman; they can reflect and analyze to guide themselves; they can heal their past wounds and avoid future wounds but being someone else's Shaman is another thing entirely
In the Gaelic tongue there is a phrase:
An tsl铆 bheatha
Which translates loosely to English as - the way of life
To truly be a Shaman a calling is heard and you make it your way of life