“In hot water”

“A mixed bag”

A combination of good and bad things.

“A double-edged sword”

Something that has both advantages and disadvantages.

“Big picture”

The overall situation, not small details.

“A wake-up call”

An event that makes someone realize action is needed.

“Bring out the best in”

To help someone show their best qualities.

“Break new ground”

To do something innovative or original.

“Brace yourself”

Prepare yourself for something difficult or unpleasant.

“Be in two minds”

To be undecided between two choices.