i havent taken it apart on the VX yet, but putting a block of wood over the bottom of the bolt you are hammering is always a good idea.. i also have left the castle nut flush with the bottom of the bolt and then a block of wood to help even more.
a tie rod puller may help too
you should be able to remove the pitman and idler arms from the center link without having to take them off the frame and steering box
looking through old posts, tom said he had a lot of trouble with one he worked on, had to apply LOTS of heat before it would come loose
if you do remove the pitman arm completely, there are "notches" in the teeth that will help you line it back up