Using poudriere to test KDE 4.12

[Jamie Paul Griffin]

In light of recents problems i've experienced with trying to upgrade my 
KDE installation, I thought I might use poudriere to build it all and test it.

I need to rebuild the X server including WITH_NO_XORG=yes set in 
make.conf and obviously all the KDE 4.12 ports.

I've not used poudriere before so, if I do this once the software is built 
into usable packages will I be able to install them to test them out? if it 
works out i'll stick with them; if not, will I be able to revert to the older 
set of packages if needed?

Thanks for reading, 

Jamie.