Disasemble the pump by unbolting the six bolts holding the stator support to the pump.
Drive out the pump bushing with a bushing driver. Use bushing driver to install new bushing. Using the side of a round screwdriver, peen the bushing at the notches inside the pump.
Note, I actuall use a cam bearing driver as my bushing driver
Install the seal at the same time, lube the bushing and seal, and re-assemble the pump.