Keeping in line w/ the whole K.I.S.S. philosophy, if the trout in the Park are rising for a hatch, I promise you'll catch plenty of fish if you can get a good drift on something approximately the same size, regardless of color or pattern. You would probably catch more if you have a perfect match to what is hatching, but don't get too bogged down in the details. All this stuff just starts coming naturally to you the more time you spend on the water. However, I am in no way discouraging you from your efforts to learn these important nuances of the sport! Party on.
I got no style, I'm strictly roots.