Where are you at? I would be looking at finding a barn/stable that is willing to let you work off lessons.
As a trainer, a trail horse is not a horse you will learn much off of, because they are trained to follow the leader, so to speak, and because of the nature of a trail ride, that is what you will be expected to do...sit there and 'enjoy the ride'. Find a barn willing to work with you, and you will learn much more.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."