[dBlast]

I have the same setup. It is not that hard to replace the O2 sensors. You don't need to remove the cat. Depending on what cat you have, you may need a special O2 socket that has a cutout to accomodate the wire. On the stock zetec cat (non SVT) there is not much room for a wrench, so this special socket is needed. On my RT cat I just used a regular wrench.

Which cat do have?

I have something similar to this:



You can see on the RT cat that there is ample room to access the O2 connections.
(thanks to mpcv2000 for the nice pic. Happy BD mpcv2000 BTW)