Introduction: Patience is key. Patience with both kids/adults, as well as with the horse/pony.
Good things can be rushed, great things require time. I pride myself in being patient, kind, and forgiving. It is much easier to create a "pretty picture" correctly from day 1, than trying to fill in the holes left behind from others.
Seeing progress! From a first time rider to a colt's first real ride, the satisfaction of seeing it all come together is astonishing.