Honest criticism is hard to take, particularly from a relative, a friend, an acquaintance, or a stranger. - Franklin Jones
Crucial importance of willpower/self-control/conscientiousness/grit. Mindset. Mental contrasting, implementation intentions, wooping. ‘Driving the bus’.
Note there are already a number of resources available on this website that are relevant for "Willpower & Making It Happen". Look, for example, in the "Wellbeing, time management, self-control & self-determination" section in this website's "Good knowledge" area.