The idiom "bang head against wall" means to hit one's head repeatedly against a wall or any hard surface in frustration, anger or desperation. It can also mean to encounter an obstacle or situation that is difficult to overcome or solve.

The idiom "take over" means to assume or take possession of something, usually a role, responsibility, or business. It can also mean to begin doing something that someone else had been doing beforehand. Figuratively, it can refer to gaining control of a situation or a person's life.

The idiom "cut both ways" means that something has advantages as well as disadvantages. It suggests that a decision, action or situation can have both positive and negative consequences.

The idiom "the ball is rolling" refers to the progress or forward motion of something that has started moving, especially when it has gained momentum and is now rolling smoothly.

The idiom "the lion's den" refers to a place that is very difficult or dangerous to enter, escape from, or survive in. It can also refer to a situation where someone is confronted with a daunting or formidable challenge.