Since no one else has mentioned it...
I get my best results with nymphs when I fish the edges of slots. The old standard rule for trout is- where the most water goes through the narrowest spot is where the fish are. The sides of those slots, where the fish can stay out of the heaviest current and still see all the food going by is where your nymph should be presented deep and drag free. That means starting the drift well enough above the target area so the bug has time to get well down.
Since nymph rigs tend to be a mess to cast and control, try for short drifts and easy, short water loaded casts.
"Every [child] has the right to a first fish. On this particular planet, no man is granted a greater privelege than to be present and to assist in the realization of this moment" Bill Heavey