oh its easy to get to be a shaman...

you just have to get one of your alternate personalitys (or the distorted demons only you can see if they are willing) to indite you...  this usually happens in between the time filled by jabbering to oneself in a corner peeling the layers of paint off the walls wishing the people in the white suits would let you go back to the library so you could go back to the dmt nexus site