[yt-users] Installing YT to co-exist with existing Python packages

Hi, I don't know how widely this has been discussed (sorry if it has and I've just missed it), but how easy would it be to install YT such that it interacts with my existing Python packages? Is the easiest thing simply to re-install everything to the YT directory and re-update the PYTHONPATH environment variable for any packages not in the default Python path, or is there a better way to allow YT and my existing Python packages to co-exist without activating/deactivating YT? Thanks! Sam