On the first day of my vacation, I went fly fishing on the Yellowstone River in Montana and caught nothing but a couple of branches. That might have been because I didn’t have a clue as to what I was doing. I didn’t know whether to use flies that float (dry flies) or flies that sink (wet flies). I didn’t now how I should work them in the water. Should I just let them drift with the current, or use a fast or slow retrieve? I didn’t know which areas of the river would be most productive in terms of holding actively feeding fish. Did I mention that it had been 20 years since the last time I was fly fishing? The next day, that all changed when a good friend took me fishing.