To upgrade, run your usual before-upgrade backup procedure, then change $LJHOME/cvs/livejournal/multicvs.conf along the lines of http://hg.dwscoalition.org/dw-free/raw-rev/0845df63214b (that patch won't apply on a stock LiveJournal multicvs.conf, but it shows what you need to change. (And you should use the URL in the patch, not the one in the README.) After making the change, upgrade your live area as usual, then run the following commands:
Check that the content of $LJHOME/cvs/Data-ObjectDriver looks reasonable, then upgrade your live area as usual (yes, again). Once you've done that, you should stop and restart all TheSchwartz clients and workers, and monitor them carefully for a few days, as TheSchwartz is the main user (or perhaps the only user - I don't remember ATM) of Data-ObjectDriver.