How hard is it to do a water pump on a vauxhall vectra 1.8 16 valve?

have a water pump to change been told not to do it take to a garageHow hard is it to do a water pump on a vauxhall vectra 1.8 16 valve?Shouldn't be too hard, hey I'm a girly and did one on my vauxhall cavalier 1.8 16 valve! You should have no trouble. ;-)