If you search the videos on the net re fly tying tutorials, you will come across an extensive series by Davie McPhail. I never tire of his pattern selections…always informative beginning to end. There is something to learn in each tutorial. Davie talks with a bit of an accent…well an accent to my ear…but the ear adjusts soon enough and the sequences are so well done that you learn the moves easy enough. Here (X) is the link to a spiffy bead head Caddis Pupa pattern. 

McPhail Caddis Pupa
Davie McPhail Caddis Pupa Pattern…YouTube Snap