Reiki is a very simple technique to learn and is not dependent on one having any prior experience with healing, meditation, or any other kind of therapy.
Anyone can become a Reiki Healer if they receive an attunement. You do not have to have a certain belief system, be spiritual, or have a religion, nor do you need to engage in elaborate studies of Reiki for it to work, but you will find yourself seeking more information on Reiki and sharing experiences and techniques with other healers after becoming one yourself. You will find your life altered for the best and usually will develop a higher level of consciousness and spirituality.
Everyone can naturally channel this life force to a certain extent. There are even a few gifted natural healers who have never received a Reiki Attunement. Some successful healers have been attuned to this life force in a different method because of their culture, but Reiki Attunements are needed and used by most people to open, focus, and increase their natural abilities with this life force.
Once you start a Reiki journey, in addition to healing abilities, you will find your life altered for the best and usually will develop a higher level of consciousness and spiritual awareness.