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.

Successful nymphing starts with your setup. A two-fly nymph rig is often the way to go – it allows you to cover a wider range of the water column, and it adds variety to your patterns. I’ll typically ...