Hoki--Ned------Not many secrets here- Never be afraid to ask anything on L/L, the lure "brains trust" of the world in on here and most guys are willing to help .
I have only made two of these and really it's easy-- If you know how to make and apply a 'waterslide decal' (called 'Transfer' here) just do it the same, BUT you need to add some sort of water based 'medium' to the water to make the feather stick - if you have never done this, Google "water slide decals how to".
Adding "Water based mediums" -- matte is best??? take your pick of brands, depends on the brand of paint you like to use, they are pretty much the same anyway.
Oh yeah sorry Hoki, missed that Q, "how do you get a feather design on a bait"??-It's not a feather design, it is a feather, you can buy by the bag, from the fly fishing shop.
Needs at least 3 coats of epoxy clear to cover all the high spots (quill etc)--watch out for air bubbles when laying it out.
Pete