No it's not an "Easy" shot, even with a scope, due to the fact the target was moving.
Even for experts, moving targets are always difficult when attempting to place near perfect shots. Throw in the stress of attempting to shoot a US president, actually ID'ing the target in a short time window, with the big thing on your mind being, "Escape" etc.
To be honest with you, I believe very little of the governments version of this event. ,
Uh, yes it is an easy shot, going away from a person at a slow and almost steady speed (see the film of the car coming around the corner). Also, Oswald was a steely character and didn’t give a fig that it was the President—have you seen him questioned by the press in the Dallas jail? Cold, very cold.
ID’ing the target was hard? Get serious — at that range it was so obvious an ID that your comment provokes laughter all around....