certain, sure, convinced, self-confident, self-assured, capable, overconfident, cocksure, assured, positive, more...

unsure, doubtful, insecure, hesitant, timid

self-assured, assertive, poised, self-confident, self-reliant, self-sufficient, more...

self, more, very, highly, how, 112-119, watchful, uncertain, over

"i've got this!",   pretty sure,   not hesitant,   sure of oneself,   assertive one,   very sure,   sold on one's self,   more sure,   sure of yourself,   feel empowered,   sure of himself