The idiom "the calm before the storm" refers to a peaceful, serene, or calm atmosphere that precedes a sudden change or event, often one that is unpleasant, chaotic, or disruptive.

"Head start" is an idiom that means to have a lead, advantage or an early opportunity compared to someone else. It can also mean to gain an edge over someone or something by acting quickly or making a decisive move.

"Six of one, half a dozen of the other" is an idiom that means two options or choices are equivalent or indifferent; it doesn't really matter which one you choose because they are essentially the same. It suggests that there is no significant difference between the two alternatives.

"The brains behind" is an idiom that refers to the person who has the most important role or contribution in a project, business, organization, or team. This person is often responsible for making decisions and strategies that lead to success.

The idiom "when pigs fly" is used to indicate that something is extremely unlikely to happen or never will happen. It is a figurative expression that uses the image of a pig, which is considered an animal that cannot fly, as a way to convey the idea that something is highly improbable.