Easy to do mate.
Buy a genuine oil pump and oil pump strainer(£12) with seals, also sump sealer
* Remove sump
* Remove strainer(2 x bolt)
* Remove bolts out of pump pulley(pulley off)
* Remove bolts out of pump(pump off)
* Fit pump(with pulley off)
* Fit pulley onto chain and back onto pump
* Fit sump(clean off and reseal edges)
You'll obviously need oil and filter as you'll have drained it all.