[galaxy-user] Installing Galaxy on a Cluster - What to do about Python

So I'm installing galaxy on our SGE cluster. I'm trying for the "unified" install option. We do have Python 2.6 installed on the cluster, but I'm not allowed to install any new libraries to it. Could anyone provide me with some basic directions on how to set it up with virtualenv? I've never used it before. And I'm using contrib/galaxy.fedora-init in init.d to start and stop the service. Would I need to reference virtualenv in there? Thanks, Greg