I did one on a straight 6 Chevy PU maybe 10 years ago. (Thanks for the flashback

) A CJ should be real similar, if not identical.
First I bought the pump & o-ring, then proceeded to make a mess of it all removing it...
Then used my shop press to destroy the old pulley. It ended up looking like a Pringles potato chip.

but the sucker was still locked to that pump shaft.
Then spent a few hours scrounging the JYs for a pulley, bought one and it was the wrong offset. $15 and had the proper one at the GM dealer the next business day.
Then put it all back together and it was the damn reservoir leaking after all!
So the moral of the story is get the pump and reservoir as a unit (probably won't have the pulley on there) also have the pulley puller/installer or know where to get it off & remounted somewhere local. (maybe at the parts store?) Line wrenches will be your friend, as well as having more PS fluid that you think you'll need.
I didn't break any bolts off in the block or head, but in hindsight, hitting them with a shot of PB Blaster the day before might have been a safer play.
Good luck with the project and the mission.