How can I disable the X-server on Fedora 17?

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http://unix.stackexchange.com – I want to use a Fedora 17 "Beefy Miracle" system as a network-shared desktop for cooperative work. For this I'm using TigerVNC which brings its own X-Server and starts a completely separate desktop session in it, which then is exposed via VNC. As I don't need the regular X-server I would like to completely disable it to free some resources and to enable the VNC desktop to a $DISPLAY of 0 . I have no experience using systemd and Fedora's service structure and therefore have no idea how to securely disable the service. I tried disabling prefdm.service which seems to be the peak of the iceberg, (HowTos)