Removing and Reinstalling Pitman Arm

Trying to replace my pitman arm. Stopped by the local parts store and rented their front end kit. First I snapped a piece off the puller then I snapped the head off my socket. I've sprayed it down for weeks with PB Blaster. Is there some trick that I am not doing correctly? And yes I removed all the bolts. Once I get it off, how do I get the new one seated on the steering shaft?
Thanks in advance.
Garth
98 XJ

I have gotten them off by putting the puller on and tightening it on as tight as I dare then tapping the pitman arm with a hammer around where the shaft goes through. Putting the new one on is easy, slide it on and tighten the bolt.
Dave

Also, applying heat is helpful.

Carefull with the heat or you will fubar the seal in the Saginaw unit.