I have played with healing a bit as far as I find it practical. I find that if I get a cut, or I catch myself early starting to get sick theres a way to speed up recovery. I basically just move energy to my hands and imagine it as green and healing, and the spot of sickness or the wound I put my hand near it and charge the spot with energy.
I imagine all the pain and infection as nasty black colored energy and the green energy breaking it apart until it dissolves away, then speeding up recovery. I think everyone heals differently, a Reiki master would use universal energy I use my own. I think it depends what your doing too, if your already sick it may be better to heal naturally. If you try to heal your body and the energy doesn’t come easily, DON’T PUSH IT! Your body is low on resources and is trying to hang onto all its energy to heal itself and boost the immune system.
