Shamans work with different stages of Trance.
No, you don't have to take in anything to enjoy this state of mind.
If you are busy doing something you like it's possibel you feel lifted,
this is already a Trance-like experience.
Using Drum or Rattle you can bring yourself in the Alpha State of Consciousness
were Shamans make contact with the Ancestors, Totem-Power Animals and Guides.
During a Shamanic Trance Journey you can explore the different Paths
into the Other Dimensions.
If all this is new for you, find the keys in a Guided Shamanic Journey.