Interesting to read of the Mixture / Carb Heat confusion among students.
Never done that ... however I now sometimes fly an aircraft with a carb heat control, and sometimes fly one without. Sooner or later I'm expecting to pull the "carb heat" whilst downwind in the wrong aircraft, get the throttle instead, and wonder why the engine has dropped back to idle ... but as I'm expecting to do this one day I
hope I'll recognise it when it happens and sort it out...