I would say a lot of pilots early on just freeze in the flare, but most trainers manage to land themselves most times and the pilot gets away with it. I swear when I was a student it would almost seem like I blacked out in the flare with no memory of how I got the plane down, it just did it. It took many hours and landings before I really felt like I was actually landing the airplane. I will echo the technique of having a student fly down the runway without touching down. It is especially helpful to demonstrate the use of crosswind controls and what you are actually doing. I will have the students fly from edge to edge of our 150 foot wide runway using just aileron while keeping the nose aligned with the runway. Another thing I say to try to help students learn to land, is imagine you are playing a game where the airplane wants to land, but you don't want it to. You try to hold the plane a foot or two off, and keep fighting to keep it there instead of touching down. It helps visualize what we mean when we use the word "flare". Early on as an instructor I found students didn't quite understand what I was doing, and what I was asking them to do when we "flared".