How easy is it to change the water pump on a 1.8 zetec (circa 1992)?

Does anyone have an electronic copy of Chapter 3 of the zetec haynes manual that covers the removal/refitting of the water pump?

Does the timing belt need to come off?

Mine seems to be rumbling and the pulley shaft is slightly buckled. I suspect the bearings might be on their way out.

Its quite easy but youl need the cambelt off which means a replacment.