What is it like to perceive without 5 Skandas?

My understanding of Nibbana is a person who has overcome 5 skandas. I could not perceive the state as we are constantly bombarded with internal and external stimulations which makes me assume that this state can never be achieved and only an incremental change towards nibbana can happen. This leads to another interesting observation, if 5 skandas are overcome, does one really need a body? If body is not needed, then is Nibbana attained only at death? What is it like to be without skandas?