If you have a working system, installation consists of (as described in detail in previous post): set gconf keys, backup current hildon-desktop.launch (with mv command), and copy latest hildon-desktop from my page to /usr/bin/hildon-desktop.launch . The extra steps with dbus-scripts and hdk are only needed if you want to use global shortcut keys.

This should not cause a non-working system, but if it does, you need one of the recovery methods described earlier, or a reflash.