very carefully.
And the quickest way is by doing nothing what so ever.
Instructors that couldn't teach one, cause the student to take longer to learn than if they had been left to work it out for themselves.
You can inherit students from this type with 20-40 hours in the circuit with 4-5 hours for the previous exercises. When you dig a bit deeper a circuit lesson was comprised of 1-2 circuits which were "dual" controlled in the flare and much of the approach. Then a demonstration usually a low level bad wx circuit with steep turns at every corner just to get the plane back to finals. The brief is "thats how you do it" then the rest of the hour is spent with the instructor getting more and more fustrated while the student gets more and more dispondant.
A spell out side the circuit going through the previous exercise and making sure they can trim properly usually cures everything.
There are students though that are quite happy with this method, the more talented ones, but most arn't. And then you have the issue that they then think its the normal way to teach someone to fly when the wheel turns and they are then in the RHS.
Note:
Not all students that are in the circuit that long because of instructor issues. There are a selection of students which have other issues usually to do with brain farts and consistency. They are denoted by not managing to link up all the phases of the circuit without making a mistake. Very often its a different mistake every time. Which is a far harder problem to solve.