I prefer to use cdc puffs... But I don't have too many of them so I have two methods of tying these flies.
The first is to tie the feather in by the tip, with the stem facing back. Then fold the stem forward and tie off and trim. The wing length should be about the same length as an elk hair wing, and I like them to be relatively thick.
The other method is a bit more messy and wasteful, but ties a nicer wing...
take two long feathers and hold them together by the stems. Run your fingers down each side of the feathers to strip the fibers off, trying to keep them properly stacked. I often used hackle pliers to keep them together. Keep stripping feathers and adding to the stack until you feel you have enough and tie in as the wing.
Here's some pics to show you about how thick to make them:
http://tcoflyfishing.com/1Flies_Viewer.cfm?src=16256
I prefer them over elk hairs for picky trout, but you can't beat the highly visible EHC for pocket water or mountain streams.