The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
Not a big deal...A rather simple, "guide-fly", type of fly.
Appropriate size hook for mayfly you are trying to imitate...Some use dry fly hook, some wet.
Wind thread on hook to rear of shank and dub a small bit of dubbing to facilitate the split tail...Tie in your stiff tailing fibers, either spade hackle or paint brush like tailing material and arrange so you have equal amounts on either side of dubbed ball...Wind thread tight up against this ball and they will split forming a nice v off the back of the hook.
Dub your tapered body a hook eye or two back from the eye.
Stack a small clump of appropriate color deer hair for wing...This is an emerger and the length of wing is open to debate, but start with wing tips about halfway back over the body...Wrap right up and against where the dubbing stopped.
Lift the butt ends up and tie in front of them, not unlike some tie an elk hair caddis, and whip finish. Then snip the butts at an angle with the wing...Again...Like an elk hair caddis.
If you have problems with the deer hair wanting to spin, don't let it...:) No...You can weave your thread through the butt hairs before you trim them...Craig Matthews, on his Sparkle Dun, divides the butts into thirds and places a firm wrap through the hair at each third...
Now...Other questions...Though a simple tie, what color should the emerger be? :)
Take a few moments to visit Charlie Cravens web site at www.charliesflyboxinc.com
Click on "Flybox" tab to the right and view each of his listed patterns...Each has a wonderful step-by-step tutorial.
You'll be tying like a pro in no-time!