style it out
rely on
make book
superconfident
confidently
have one's tail up
ultraconfident
fiducially
surefooted
surely
empowered
hyperconfident
feel up to
bet a dollar to a doughnut
self-confidently
assertive
jaunty
boldly
sure-handed
trust
believe
securely
convincingly
too big for one's britches
jauntily
positively
composed
self-assuredly
rosily
competently
credibly
like a boss
overweening
compellingly
home and dry
anticipation
uptightly
expectation
can-do
satisfiable
prudently
performantly
determinedly
life-affirming
avowable
knack
smugly
proficiently
stand-to
natural