@CkickenHouse: it depends on the subtask. As a student I had a very difficulty of keeping the same speed and altitude. Over time this became much easier. The same holds for landing and doing a correct flare. But I agree it's difficult to draw a line when it's easy enough. I hope every pilot keeps his concentration during landing... Even if they can do them with a blindfold.
Without reaching stage 3 you won't get your license...