First off, if you want the stanchions out of the lower legs you don't need to remove any seals just undo the lower legs bolts and remove.
When the stanchions are out, in the lower leg you can heat the dust seal with a hair dryer and lever it out, the oil seal underneath will be tight but again, a decent taped over screwdriver as a lever on the inside edge should pop them out without too much fuss. I needed heat on mine but then they were easy.