Preparing for a trip should include a study of casting books and videos, any necessary lessons, and plenty of yard or park practice. When you sacrifice time, money and energy for a major adventure, the bother of some extra casting practice should be pretty low on the pain scale. The major reason that people will not work on their fly casting is that they possess the average ability required to deliver the fly and catch fish in average situations. But a raging wind will reduce a typical fly fisher to neophyte status. Difficult currents on the Provo River will give a guide just as much gray hair as the eager client yet all too often it's no fish, no tip.
Good casting produces good results, which means both more and better trout.
The number one casting problem that keeps anglers from getting to fish is hinging, flexing or bending the wrist. The inability to flex the rod correctly causes the rod to fall low to the front and rear. Casting energy is dissipated to the outside of a large casting loop, which often merely piles the line to the front of the angler. In contrast to an underpowered loop, a tight loop produces maximum energy to cheat big winds and add distance. For a checkup, go to a local fly shop and have them evaluate your casting stroke and loop formation.