Okay, now you're ready to snatch the axle seals out. There's a variety of special pullers you can buy/borrow to remove the seal, but I've found that a big rolling head prybar works best. Insert the hooked end of the prybar like so...
Then pull the bar outwards and forwards...
And huzzah! The seal is out.
If all you're gonna replace is the axle seal(s), you don't have to go any further. Use a rag to wipe up the excess axle oil and junk around the axle tube and beat the new seal in with a hammer. If you're gonna go ahead and replace the axle bearings, keep on reading: