This stuff is cool! Bascially wrap like hackle, then trim to desired shape. Couldn't be easier.
Greg Senyo and Jerry Darkes have been using this stuff on a variety of their fly patterns. It can be used to create the entire pattern or used as a collar material for example on spey flies. There are a few pictures to show how it is wrapped and then a picture of a finished baitfish.
Pretty big hunk of the stuff per package.