Once you've demonstrated to God that you're spiritually living "outside the box" by having successfully identified and thrown away the traditions of men (which are often mingled with scripture), once you've acknowledged your nothingness before God, once you've checked your motives and have essentially "lost yourself" with an eye single to the glory of God, and once you're hearing Hs voice and relying on Him instead of a mortal-made checklist, then you've passed the pre-requisites to the Gift of Healing.