In theory, fly-fishing is a simple sport: Pick a body of water, choose a fly-fishing rod, select your “fly” (or bait), tie a secure knot, cast your line and, hopefully, land a fish on the other end.

Fly fishing doesn’t come naturally to most people. Some may pick up the skills faster, but everyone has to work at it. And it is not just the casting, if you look deeper into fly fishing you will see ...