Pulling off the correct shots in JFK reloaded is actually not that hard. The issue with getting a perfect 1000/1000 is how stupidly perfect your timing needs to be, down to the exact millisecond. The accuracy and ballistic trajectory of the bullet is easy comparatively.
Sure it’s not easy, but the shots individually arent hard, syncing up all 3 in perfect timing is.
And ya, it’s very much unlike actual shooting.
Oswald didn’t have the chance to practice over and over, but he also didn’t have a set of shots he was trying to match perfectly, so it was much easier for him.