rely on
make book
style it out
feel up to
have one's tail up
confidently
superconfident
trust
believe
bet a dollar to a doughnut
surely
fiducially
convincingly
ultraconfident
hyperconfident
determinedly
surefooted
empowered
securely
self-assuredly
guarantee
boldly
self-confidently
assertive
clarifiability
preparatorily
insure
ensure
prudently
secure
assure
complaisantly
convictively
sure-handed
go bail
stand-to
outcon
proficuously
cut it
home and dry
cut the mustard
avowable
qualifiable
aptitudinally
undoubting
beseek
flatly
reputably
competently
uptightly