ultraconfident
hyperconfident
superconfident
make book
confidently
assertive
surefooted
style it out
have one's tail up
like a boss
superconfidence
surely
securely
fiducially
boldly
rely on
trust
believe
jaunty
self-confidently
empowered
self-assuredly
undoubting
masterfully
jauntily
in all likelihood
likely
in all probability
probably
belike
sure-handed
flatly
presumingly
feel up to
overweening
convincingly
unstaggering
courage
self-assured
man enough
too big for one's britches
stanchly
well
self-asserting
woman enough
self-assertive
staunchly
avowable
self-confident
bet a dollar to a doughnut