Blessing in disguise
A good thing that seemed bad at first
It's not rocket science
It's not complicated
Go bananas
Go wild or crazy
Your guess is as good as mine
I have no idea
Call the shots
Be in charge or have all control
Hit the sack
Go to sleep
Fingers crossed
To wish for good luck
Spill the beans
To reveal a secret
Cutting corners
Doing something poorly to save time or money
Bite the bullet
Force yourself to do something you don't want to do
Break a leg
Good luck
Give him the benefit of the doubt
Trust what someone says