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The listed skills were also sorted according to difficulty. In the above example, from easiest to hardest, the categories are Red, Yellow, Green and Blue. There was also a note that continual practice was needed to maintain mastery of the skills learnt.
Like swimming, the responsibility of providing healing to a group requires the mastery of several skills. Like swimming, some skills are more difficult than others. And like swimming, being a good healer requires continuous practice, not only to maintain current proficiency, but also improve on it. In the spirit of the above example, I have prepared a checklist of the many skills a healer needs in order to heal well. It assesses the following general criteria: