Usually that is on a Massage table, the floor, a couch or chair. Clothing is left on, usually belts and shoes are taken off so they don't feel tight after a while. Once you are comfortable as the client, you may feel the need to stay quiet, talk, cry, laugh or fall asleep. It is the energy helping you do what the bodies need. The practitioner should respect your needs and emotions.
All sessions are confidential.
You will begin to feel energy flowing from the practitioner's hands. We all experience Reiki energy differently, even from day to day. Accept them, it's part of the healing. It is a good idea to keep a journal at this time. Things that happen to you may not seem as important as they really are.