It can be argued that self-healing is the most important part of Reiki. Even if you have learned Reiki only as an added skill to use with your work, you will be surprised what a stronger healer and even calmer person you can become with regular self-healing.
Serious practitioners of Reiki continue to self-heal every day. Even if you have done no self-healing since your attunement, you can start today. There is no time like the present, and your attunement will still hold. You can also learn more about reiki attunement tips.
The process itself that you use depends on your particular Reiki discipline. Each good Reiki discipline is a very good system of healing. Of course, they all have common ground too.
For example, all Reiki disciplines teach the Reiki Principles or Reiki Precepts. This is a set of guiding statements which anyone can do well to follow. It is hard sometimes to live by these principles; but we can achieve an amazing inner peace and contentment when we try our best to.
And every day, you can treat yourself with Reiki. The more you self-treat, the stronger your healing will become and the better your energy will flow. As your energy flows more smoothly, illness is minimized and contentment is maximized.
Reiki is a complete way of life. And that is the greatest gift that Usui left us. We often do not need more attunements, more certificates, more accolades, or more ways of being clever with Reiki. Self-healing is simple yet very powerful.