Whi;e a pickel fork will get break loose the taper it will/may also distroy the boot/seal on the joint. No big deal is replacing the tie rod which come with to boot but those boots are seldom available alone. The better way to loosen the taper is to take the nut off, turn it over (castle side first), screw it down so it is just above the end of the threads (this is all to protect the threads, you want to push on the nut), put a jack under the nut, lift the wheel just off the ground and wack the arm where the tie rod end goes through it with a good size hammer. The taper will pop apart pretty easy with no damage.