Might I venture that if the student is nervous and heavy handed they are probably not yet competent enough to be doing the "enter and recover from stall" unit?
Aeroplanes don't yank their own controls around so to do so in a lesson without the student understanding disorientation is unrealistic. So, teach the human factors of disorientation, teach unit A3.5 (Control aeroplane at slow speeds) and make sure they are competent in that before moving on to A5.1 which has the key words "recognise/control/recover" not "push/pull/yank/shove/boot" and if they want to do more extreme stuff then go and do it as part of an aerobatic exercise.