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