1) Place hook in vise and attach thread at eye and run toward bend about the size of the head.
2) Attach yellow marabou for tail (shank length long) and then red marabou. Run thread to bend.
3) At bend, attach a doubled piece of red chenille for the back. Strip about 1/4" of the chenille off to avoid bulk at the bend.
4) Strip a 1/4" of the yellow chenille and tie it on at the bend also.
5) Attach an appropriately sized hackle by the tip (also at the bend). Run thread to the spot where you will build the head.
6) Wrap the yellow chenille to the eye and tie off.
7) Fold the red chenille over the yellow and tie off at the same spot.
8) Wind the hackle in open turns to the previous spot and tie off. 9) Build up the head, whip finish, and cement.

The Mickey Finn Bugger is fished the same as any other Wooly Bugger. In other words, there's almost no wrong way. I particularly like to strip it across stream or strip it back from 3/4 downstream. While I have had decent success with the fly in the Catskills for Brown trout (the Rainbows on the Esopus, particularly the smaller ones, love it), I imagine Brookies would go ape for it.

Experiment and enjoy!