Modern Western culture is different from traditional Eastern culture and this is probably the reason for many misunderstandings when we talk about the question of possession in shamanic practices of Siberia and Asia.
When I speak to Westerners and try to explain to them the context of the shamanic trance in which the shaman is possessed by Spirits, I systematically use the word incorporation rather than possession. Incorporating is immediately less frightening for them because in their subconscious, this word is associated with an act in which they retain control while being possessed is associated with an act undergone. A Westerner cannot imagine being possessed and keeping control at the same time, because as we observe every day, the Westerner needs to believe that he is the only one who has control over his life. The word possession is therefore understood in the Judeo-Christian sense of the term and is irretrievably associated with the fact that a possessed person is a victim who needs to be exorcised by a priest. We cannot act directly on this belief deeply rooted in the collective unconscious.
Everything is always a matter of definition and definitions are directly built by each culture, over time and experience. Moreover, not everyone has the capacity to approach a foreign culture by ignoring its original culture. Being open to other concepts, to other visions of reality, is a matter of neuronal connections and no one is to blame as no one has chosen, in consciousness, how he would use his brain during his incarnation experience.
Communicating by being and remaining open to the other party seems to be the most constructive solution, but again, we are not all equal...