You can use crystals yourself to heal or find a qualified healer. Most crystal healing is guided to the healer by Spirit. Spirit will tell the healer which crystals will be most effective and in what patterns the crystals should be placed on or around the person's body. The length of time used with the crystals will vary with each patient and healer. The healer must determine the patient's frequency and attune it to the crystals that will place it in balance.
All healing is about placing the body in balance.
Treatments will vary in length and number of times required. They may not always work. It's always good to have a few quartz crystals around your home to balance the energies - before you need the healing. Many people connect the color frequency of a specific chakra with that of the stone being used. The person needing the healing would lay down - the blue crystals being placed on the throat chakra.