You don't need to remove the metal water pipe.
Jack up the car (or get it on ramps), support the engine by the gear box, then remove the 2/3 support bolts from the bell housing/starter motor, pull the starter out, then remove the old bell housing bush - fit a new one, and re-fit the starter.
Generally, it only takes about 1.5 hrs if everything goes okay, but in the past, I have managed to round off the allen head bolt - and resort to using a stake and hammer tap it round.
Usually the fiddly it is lining up the bolts again as the engine tends to sag down ever so slightly from the position it was in before you withdrew the starter.