Folding Hackle is really simple if you use the Joe Ayres foam block method. Start by getting a block of foam (the kind you find wrapped around computer equipment to protect it in shipping) about 3"x3"x10" long. Cut 1/2" deep slots in the foam -- you should be able to get about a dozen slots in a 10" piece of foam. To fold the hackle all you have to do is insert the feather's stem in the slot and the hackle is folded.
wire through hackle
wrap the wire through the hackle using speed wraps. the quick wrapping of the wire pushes the hackle fibers out of the way vs trapping the hackle fibers under the wire wraps.