First you will need to loosen the timing belt tensioner and remove the belt from the water pump pulley etc. The undo the 3 10mm bolts in the pump and there is a 10mm nut on the bottom far corner. once thats done just give the pump a bit of elbo grease and it will come out.
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This is the old pump on the right, you can really see the difference compared to the nice shiney one on the left, the bearing in this one is knackered.
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Get some gasket sealant and put plenty of it around the flat surface that will sit against the crank case,
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Make sure to scrape down the surfaces where the pump and the block meet, use a stanley blade and then rub it down with a light sandpaper.
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Refit the pump in the reverse of removal, This is the pump refitted,( Nice and clean isnt it)
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Then refit the timing belt and tighten up the tensioner, out the belt cover back on and anythin else you have to remove!(y)
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Good luck, and hopefully no more overheating!(y)