Adults learn from experience, which means that your participants will know what environment suits them best. Your group environment must make room for all of these respective experience-based comfort zones. For instance, if one person would like the lights on, and another prefers them off, try both. If some relax better on the floor, make sure their space is comfortable. Always make sure the room is at a comfortable temperature and free from distractions.
Nothing is more disruptive to the imaging process than intrusive sounds or interruptions.
Physical comfort is also essential. Backaches, headaches, and even the common cold can interfere with the hypnotic procedures of visualization. Make every effort to minimize any physical discomfort your group members may have. Prepare the Group with Information. In most groups you will find some people who are familiar with guided imagery and others who are complete newcomers.