You draw a bare shaft to full draw and have someone make a mark on the bare shaft opposite your nose. Then fletch one arrow so that the back of the fletching touches the mark. This will probably be 1 1/2" - 2" from the valley of the nock to the back of the feather. Shield cut feathers seem to work best, as they seem to give me more of a definite point of contact compared with the more rounded off parabolic feathers. Left wing seems to work better than right wing. The cock feather should be about 90 degrees or maybe a little higher to the string.
Shoot the one arrow for quite a while before you fletch any more, because it is likely you will want to move the feather up or back a tad. The idea is for the feather to touch your nose at full draw.
If you rotate your head to get your nose behind the feather, you will hit your nose with the string. If you tilt your head instead, you probably won't hit your nose with the string.
BTW, I've noticed that Byron Ferguson gets a similar effect by holding his head such that the feather fits underneath his nose. You can do this with feathers mounted in a more normal position. I've tried this, and it works about as well, as far as I can tell. But now that I've refletched all my arrows for end of the nose contact, I guess I'll stick with that.