In Hebrews 5:5-6 we are told that Jesus Christ received the Melchizedek Priesthood. Jesus gave this authority to his apostles and they eventually performed many mighty miracles. Male members eventually receive this priesthood. So how come Jesus could heal more effectively than we seem to? After all, it is the same priesthood. Doesn't God's power to heal just come zipping down that line of authority into our hands?
Healing takes spiritual effort and faith. Jesus noticed something go out of him when the woman touched his clothes to be healed (Mark 5:30). Luke 6:19 makes this same statement: "...for there went virtue out of him, and healed them all".
Scattered throughout the D&C we find many virtues that we must have for an effective use of the priesthood. It also states that if used for wrong reasons you have no priesthood authority (D&C 121:37).
Of the many virtues necessary to use priesthood, many relate to love. We must have love for the person we are healing. Love is so important in regard having heavenly type powers. The apostle John said, "God is love". How can a statement more plainly express how much love God has? This love is a driving power that helps us heal.
Receiving the priesthood gives us the authority to act in the name of Jesus Christ. Then we must add the ingredients to ourselves to make it effective, in such situations as healing. Heavenly Father is there to lend a hand to help us to fully bring out our latent abilities. The priesthood gives us the opportunities to develop ourselves to become more like our Heavenly Father.