“Your guess is as good as mine”

“Lose your touch”

To become less skilled at something than before.

“Be in over your head”

To be involved in something too difficult for you.

“Get your ducks in a row”

To organize everything properly before doing something.

“Tighten your belt”

To spend less money than before.

“Under your nose”

Very close and easy to see, though unnoticed.

“Blow your own trumpet”

To talk proudly about your own achievements.

“Out of your depth”

In a situation that is too difficult for your knowledge or ability.

“Get your act together”

To start behaving or working in a more organized and effective way.