F19 --> F18 feasible?

[Beartooth]

	My old Thinkpad T30 (on which I ran fedup from F18 to F19) is 
beginning to seem like more effort than it's worth, ever if eventual 
success of the effort were a sure thing. Is there a FedDown lurking out 
there somewhere? 

	Will an install DVD for F18 (preferably one with both gnome and 
xfce4) let me treat the installation as if it were an upgrade, and 
preserve my data and tweaks?

	Failing both of the above, does anyone have any experience 
running CentOS on a T30 or comparable?
-- 
Beartooth Staffwright, Neo-Redneck Not Quite Clueless Power User
Remember I have precious (very precious!) little idea where up is.