Hell! Use an old brake drum for your "slide hammer." I did, and pulled my axle shafts easily.Inner axle seal can be removed easily with a slide hammer.
This operation is one which the utmost care possible should be used on. I made a nice seal driver from some SCH 40 PVC pipe, to minimize damage to the axle tube or new seals. It worked well, with nary a drop of gear oil escaping after replacing one axle shaft w a nicked journal.Hammer the new inner axle seal home with the right size socket and carefully install the axle shaft so it doesn't damage the new seal.
If the new seal looks like it's been in the parts store system for a while, it probably has. I installed one from NAPA that lasted 1 month. Make sure new seal looks new. Easy job to replace.
Easy to replace, and replace, and replace unless done right! Yes, the job is easy, but requires a bit of care. Carefully throttle anyone approaching with talk of Green bearings too, then render the carcass in quicklime for final disposal.