Plain English Meaning
The student is trying so hard to do everything exactly right that their movements become slow, fussy, and over-corrected. It looks careful on the outside, but it is actually a sign that stress is getting in the way of normal flying.
Full Definition
A behavioral pattern, recognized as an abnormal reaction to stress, in which a student deliberately and laboriously regulates their actions by adjusting and re-adjusting controls in a slow, overly precise manner. It reflects an attempt to manage anxiety by exerting visible, exaggerated care rather than flying naturally and decisively.
Context Anchor
Seen in aviation human-factors discussions about how pilots or students may react when stress becomes too much.
Derivation
‘Painstaking’ comes from ‘pains’ (effort, trouble) plus ‘taking,’ meaning ‘taking great trouble.’ Combined with ‘self-control,’ it describes someone working visibly hard to hold themselves steady — which is exactly the warning sign here: the effort is showing.