I assume the pump is not out yet. Supposedly you need the fancy tool to get the pump out but it's actually very easy without tools. Remove the filter, auxiliary valve body pipe, TCC solenoid and all the pump mounting bolts. Pry on the back of the pump through the openings in the case with a big screwdriver and it will come out.
You need to take the pump apart because the bushing is pressed in from the inside. You can get the bushing out by finding the parting line (it can be hard to see) and pounding on it with an old screwdriver (that's the way the local trans shop does it -- surprised me with the high-tech methodology).
Getting the new bushing in straight can be difficult. This is what I used:
You will need a new front pump seal (you have to take it out to get the bushing out), a new gasket for the two halves of the pump and a new pump-to-case gasket. There is also a seal that goes around the outside of the pump. It looks like an O-ring but it's square. I think that's all.