XFree86 to Xorg

I use SuSE 9.1 with the default XFree86 that comes with the distro (4.4.0-rc1 I THINK). I want to change to xorg 6.8.1. Is it safe? will sax2 generate a config file that will work? What packages are needed? Should I uninstall xf86 first or install it while X is running? Thanks!