Avoid charging for healings. Certainly, reimbursement for equipment used is valid, but charging for healings can be unethical and can get one in trouble with the law, for practicing medicine without a license. Respect the wishes of others. The energy is simply made available for their use, interpretable by their psyches, and usable according to their own Will. To force healing upon someone, whatever your intent, interferes with the other person's freedom of choice, unethical in itself, and will have unfavorable repercussions both for you and for that other person.
Some people seem to have more of a knack with the non-standard healing arts than others.
Much of non-traditional haling may tap into some of the same wellsprings, but healing in and of itself does not guarantee religious correctness. Some healers, indeed, are only marginally religious. A herbalist should learn the literature, and learn to distrust literature that does not list contraindications. Some herbs recommended in the literature are, frankly, mere superstitions. Those using creative visualization are advised to visualize the patient as being healthy and happy.