Antonyms for the phrase "gotten the hang of" might include "clueless," "inept," "bungling," "incompetent," "awkward," or "struggling." These terms all suggest a lack of proficiency or mastery, a state that stands in contrast to the confidence and ease implied by someone who has "gotten the hang of" something. Whether referring to a skill, tool, or activity, the opposite of someone who has "gotten the hang of" it is someone who has not yet developed the necessary skills or knowledge to excel. Thus, while "gotten the hang of" implies a sense of accomplishment or mastery, its antonyms highlight the challenges and difficulties that come with learning something new.