nothing special required. put the knuckle in a vise and you can knock them out with a punch and hammer. it can be a real pain. im not sure what to call it, but there is a wall between the two bearings so you have to knock one out from the opposite side. if that doesnt make sense i can go take a pic sense mine are out at this moment.
now for this change i went and bought an air hammer at lowes for $20. using the pointed bit it got the bearing out in like 5 seconds.
oh another thing, keep the steel spacer between the two bearings, you will have to reuse it with the new ones
for installing the new ones ive heard you can put the new bearings in the freezer, and the knuckle in an oven about 150 degrees. they are suppose to just drop right in. ive always just used a vise and big socket to press them in