Quite involved really but it can be a DIY job - the alternator and any other driving belts need to be removed first, followed by the timing belt to reveal the water pump behind the offside plastic belt covers. It depends on your experience if you want to give it a go, but you can buy the info from autodata on line.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.