I've done it, but only after pulling the whole engine out. It's probably a pretty awkward job. You may have to remove the timing belt to get at the pump. I don't think it needs any particularly weird tools.

96 GL Zetec ATX, white with pinstripe, nickname " Sam Smooth "
mods so far: CTA intake with homemade heat shield, KVR drilled front rotors & carbon pads w/ 500° fluid
planned mods: exhaust (want to keep it quiet), e-ram (awaiting installation), diablo chip
involuntary mods: compression increased after head gasket failure