there's no accounting for taste; to each his own; beauty is in the eye of the beholder

joyfully, cheerfully, merrily

(figuratively) to walk into the lion's den

to be single-minded, to have a one-track mind; to be strong-minded, to know what one wants; to think logically and consistently

(informal, figuratively) to misstep, to trip up, to get into a muddle

to have been lucky in one's misfortune (used when a situation could have been worse)

(simile) like a bull in a china shop

(simile) very suddenly and incongruously

(figuratively) to look for a needle in a haystack

(informal) to think carefully (before one speaks); to refrain from speaking the first thing that comes to mind, to carve every word (before letting it fall)