You can do it with the tire on car on the ground and everything together except the wheel well liner, i did it on mine a few months ago.

Theres like 2 or 3 6mm or so bolts holding the wheel well liner to the bottom of the bumper cover and then take off a few of the phillips screws holding it to the fender and pull it back. You should see the washer pump. unplug the wires running to it and then with the new pump in hand pull the old pump out and take the hose off and quickly put the new one in. (If there's fluid in there it will come pouring out. If its dry then don't worry about doing it quickly)