2002 Kia Sedona...how difficult is it to replace a water pump

I have no plans on doing it myself, I am having my dealership do the work, but they advise against replacing the WP and if I do want an additional 200-250 dollars to do it. What I can’t figure is the part runs about $80, since they are in that area already how much “more” label can there be to remove and replace the water pump?