If you guide a visualization, first focus on the subject of your inspiration — in my case, the sun. Be the sun. Speak as the sun, with every cell full of sun power to get as close as possible to the subject of your inspiration.
First, the Golden Rule: Distant healing must always be done in a relaxed, calm and loving way. Otherwise, you may be sending agitated vibrations and energies. In particular, you need to monitor that you do not have any neediness that there be a healing. The keynote is compassionate equanimity.