Hello and welcome to Just Answer. My name is Denny; now let me see if I can help you with your Jeep question.
You have to pull the diff cover, pull the 5/16'' headed bolt that holds the spider cross shaft, push in on the axle; the c clip holding it will fall off, and you can then pull out the axle.
But I have to ask; why are you changing the outer axle bearings? They rarely go bad.