The horse is a metaphor for life and becoming a master at getting your life to go the direction you want is the same process. But the way you slowly bond with life is to let life take you any direction it wants at first. The way you express you are okay with this is to be grateful for anything life throws at you. The way you "spook the horse" and have to start all over again is to try and pick the direction too soon. You have to bank tons and tons of gratitude for all sorts of little things before life will let you take the reins and suggest a new course.
The challenge is to 180 your thinking when you are unhappy with any situation and look for the good. Sometimes you have to resort to stuff like "well, I'm grateful there was hot water in the shower today." or other stuff we often take for granted. But over and over you don't let yourself get down or depressed, you keep looking for ways to say "thanks life! I'm super grateful for today's direction!" And just like with the horse you have to be patient, only once you have enough gratitude banked do you dare suggest life go the way YOU want.
from https://www.youtube.com/watch?v=X64vpuY-Npg