If you use a tape measure to measure how far in the seals are from the flange face that will make it easier when you drive in the new ones to get em to the same depth. Using the splined end of an axle works real good to pry out the old seals. get the splined end JUST past the seal ID enough to get a good grip on the seal & lever it out & it'll come right out. You could pull the pig by yourself with it on its side if need be but just be carefull to burr the threads as little as possible. EDIT the trick is to keep it comeing out evenly, use the 2 large screwdrivers then tire spoons/pry bars after its out aways