I haven't done this yet on my Jeep, but I've done a few driveway front-end jobs, and I definately think you should get a tie rod end puller. A scissors style is my preference(see below). There is nothing holding the rods in once the bolt is off, but I had one so stuck on once that it was louder than a gunshot when it finally popped out. Seriously, my neighbor came outside...
NOTE***
If you do decide to use a hammer,
PROTECT THE END FIRST! To do this, loosen the retaining nut so it covers the bolt end and protests the end from mushrooming when you beat it to death.
It is much easier to replace a banged up nut then figure out how to remove a mushroomed tie rod....As for pullers, there are 4 styles I know of, and I reccommend a heavy duty 'scissors style'. These are they styles I know of:
1) fork style (sucks): you have to jam them into the boot and wedge/pry. They distroy everything weaker than them, and still probably won't work.
Example only (don't buy!):
http://www.thetoolwarehouse.net/shop/OTC-6535.html2) pitman arm puller style (also sucks): these either look like a microscope, or a square U with a bolt in the center. It has two fixed arms that hook onto the knuckle, then the bolt pushes down on the rod end. These don't work unless they have a good purchasse on the steering knuchkle (or whatever the rod is attached to) and the bolt you have to turn is very awkward and harfd to get leverage on.
Example only (don't buy!):
http://www.thetoolwarehouse.net/shop/OTC-7315A.html 3) scissors style (very good): These come with two halfs of a 'claw' and a bolt in between. They look like scissors and turning the bolt on one end closes the clamp on the other. They fit many models, and the bolt is tightened from below. OK, Buy this one:
http://www.thetoolwarehouse.net/shop/TA-61900.html4) pipe style (rare): These are awesome, but specific to the model of car. They are made from two pipes that fit perfectly over the top and bottom of the end and they offer the most leverage with the least damage, but I don't know where to get one for a YJ...