I've recently tied up about a dozen Prince Nymphs along with some sowbugs, both of which involve a split tail biot pair. I've been doing this, somewhat un-gracefully, for years but have never quite gotten it right. What I'm currently doing is laying the biots one at a time on top of the hook at the angle I want them to stay, then lay the thread over them as good as I can without changing their positions, and tie them down. Most of the time, they completely shift and either move together forming one tail, or they will both change to different angles of their own with one pointed up, and the other pointed down. Is there a trick to tying in those biots so that they split out as perfectly as they do in the pictures and fly shops? Here's an example of the way I just can't seem to make them look: <img src="http://www.smokymountainflyguide.com/images/nymphs/LittleRiverPrince.jpg"> Any ideas or tips would be appreciated.