Drain machine by running the outlet pipe into a bucket at floor level or run the outlet pipe out of the back door if it'll reach.
Pump removal: power off, drag machine out onto the floor, remove back cover or tip machine up at an angle, locate pump, (attached to other end of drain pipe).undo 2 wiring connections, 2 hose connections - remove the tensioner clips by squeezing the tabs together with a large pair of pliers or vise grips. Remove pump mounting screws.
Installation is, as they say, a reversal of the above.
Repair and service your own washing machine. Check out www.2ndwave.co.uk/manual.html
dannyboy
December 2008