Testing Nightlies

I have Debian Lenny installed on some separate partitions in my office system. During all of our conversations and work I had plain forgotten about that install. I have KDE 3.5.9/10 or whatever the default Debian system provides. The system is current to about April or May 2010. Do I need to uninstall those KDE 3 packages before installing Trinity nightlies? Or will apt-get/synaptic handle the updates? Do I need only add the Trinity PPA to the sources.list to find to install the nightlies? (Is this the correct web page?: https://launchpad.net/~kde3-maintainers/+archive/trinity-svn-nightly/+index…) Does apt-get or Synaptic provide a way to reduce download bandwidth by updating only the differences in packages (like rsync) rather than an entire package? I realize these are not developer specific questions. I'm not a Debian guru or main user, but I might be able to help with some testing by installing Trinity in my Debian install. Darrell