The diff in my Stage 1 CTS seized (not their fault), and I need to replace it pronto. Is this the kind of thing I could hope to do myself? I've just completed a Zetec Turbo comversion in my Fiesta, but it's all coming apart again now to change the diff! The time and money saving of doing it myself would be very welcome. Any advice, books, sites that could help me, or is it a no-no and should only be tackled by the pro's?