don't you ever dare to tap tierod stud out of steering knuckle by hitting on the exposed end of it up!! don't! nap prolly gave you the best and easiest way to do it.
whacking on steering knuckle does break stud loose. you simply really have to WHACK it, not peck it. and it is not easy, as you will have to do it in very confined space. can't tell, how many times i hit brake shield doing this!
no matter how close you get it back on, counting turns, or marking threads with paint - you WILL HAVE TO re-align it. threads inside tierod are never cut the same, even by a robotic lather. you will be off one way or the other.
i quit marking or counting yrs ago. it does not take much effort to break locking nut loose. basically, what i started doing, i simply mark one point on that nut, break it just loose enough to be able to remove tierod, which is, normally, 1/4 of a turn, and leave it there. after tierod was reinstalled, i get it it as close to the nut as possible, and tighten the nut back.
but it's not inner rod or threads on it that will not match. it's the threads in the new tierod that won't. off setting it. just re-align it thereafter. for what it is, it is best to replace both sides same time.