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