To do by guesswork, erring on the side of caution.
fly blind
To do by guesswork; to feel one's way.
wake up on the wrong side of bed
To feel grumpy and irritable; to be easily annoyed.
get up on the wrong side of the bed
To feel irritable; to be in a bad mood; to have a bad day from the sta…
err on the side of caution
To act in the least risky manner in a situation in which one is uncert…