prognosticate preupgrade?

[Beartooth]

	When I first tried F15, I managed to get it hopelessly snarled; 
but now I have an expendable laptop running F16 Beta with xfce, and I 
think I can learn to live with it. The rest of my machines all still run 
F14. I'm wondering what my chances would be if I ran preupgrade twice on 
any of them. Anybody want to venture an educated guess?
-- 
Beartooth Staffwright, Neo-Redneck Not Quite Clueless Power User
I have precious (very precious!) little idea where up is.