What a session's like
I set up the environment much like a Massage Therapist. The room is a quiet, comfortable, a safe container for healing, private, and may have soft music playing in the background. I have a comfy Reiki table (a massage table without the endplate, allowing room for the Reiki Therapist's knees to go under the table) in the middle of the room.  I typically start with taking a moment to check in with the client, gain a Holistic understanding of what's occurring for the individual, what her or his needs are, and verbalize an intention or clear description of what she/he wants to get out of the session.
                           Once the intention is set I step out of the room allowing the client time to transition to the Reiki table. Most people need to know whether to stay dressed or to undress as you would for a massage. As a Reiki Therapist I do not use oils or lotions the way a Massage Therapist might. Reiki is energy, therefore, it permeates clothes. I tell each client to undress to their comfort level (whatever will allow them to completely relax and feel comfortable), and crawl underneath the sheets on the Reiki table. Once the client's ready I knock on the door and reenter the room. The client always remains draped through the entire session.
                           Depending on the needs of the client and the intention set we may choose to do a Traditional Reiki Treatment or an Intuitive Touch Energywork session. Typically, I have the client start out laying face up on the Reiki table. I most often start with the first hand position over the client's head then move towards the feet (sometimes a particular body part or organ may need the attention first so I will start there), and I have the client turn over face down to place hands on the back of the body. 
Examples of intentions set for a session:
The intention can address anything mental, physical, emotional, or spiritual. Of course, some intentions overlap but here are some general examples:
Mental: clarity, peace of mind, balance, ease with transitions, gaining confidence, stop my mind from racing, boost creativity, or a general "tune-up".
Physical: release of pain, release of tension, breaking down muscular knots or fibrous adhesions, or heal trauma
Emotional: healing the loss of loved ones, emotional balancing, trust, releasing hurt from interpersonal relationships, transforming apathy, joyfulness
Spiritual: chakra clearing, grounding, moving stuck energy, reconnecting with spirit, inner child healing, or protecting one's energy field from outside influence.