KDE - how to completely uninstall

[Bob Hartung <rwhartung home com>]

I managed to somehow crunch my XFree86 server when having problems
with my mouse and KVM switch configuration.  Now KDE will not start
and cannot "connect to the X Server."  Gnome starts up and runs okay.

So in order to start from scratch, I want to totally uninstall the
current KDE packages.  Will I be fairly sure that all elements will be
eliminated if I just uninstall the RPMs used for initial installation?

Also, does anyone know if it is possibly to redirec the reinstallation
[if I get that far] to /opt/kde rather than the default locations.

TIA

Bob Hartung