Echoing what was said here, a good way to do it is to get a head lamp, find a popular spot and get there before anyone else. Fish it as much as you can and any other untouched water. After that, explore for new water that doesn't get pressured and hit already discovered low-pressure spots. Especially when swinging flies and in lower water, I believe water that's already been covered is not at all very productive. Google satellite images are a huge resource and have changed the fishing game for me, better or worse. For hatchery fish, I like to look for out of the way, but accessible pocket water within a mile or two of a hatchery. You'd be surprised at what you can find along the side of rapids.