Before you spin the hair it's a good idea to get all the under fur out of the clump you selected. This will make spinning the hair a lot easier and make the finished fly look better. The under fur is that very fine fluff found in the deer hair. I use an old tooth brush to brush it out, but they do make combs for this purpose also, the tooth brush works well and cost a heck of a lot less.
I post on the NAFC also, I'm known as flyman there. I just saw your other post asking if there was any one else here from NAFC. Hope this helps you out a little in your hair spinning. Good luck,Dave