Are you worried about putting them in backwards?
There is a pretty good description of how to do it in the FSM. I don't think they will even go in if you try to put them in backwards.
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals
My wife's recipe website that I'm trying to help promote:
Strawberries for supper. Yes, I am a lucky man.