The idiom "spend a fortune" means to spend an unusually large amount of money on something. It is often used when the cost of an item or activity is considered excessive or extravagant.

The idiom "speak too soon" means that someone should not express their opinion or prediction prematurely, as it may turn out to be incorrect or unfounded. It is a warning against impulsive speech and reflects the idea that one should wait for more information before making a judgment.

The idiom "walk on eggshells" means to be extremely careful not to do or say anything that could upset, offend or embarrass someone. It is often used when someone is sensitive about a particular topic or situation and cannot handle criticism or negative comments.

The idiom "you can lead a horse to water but you can’t make him drink" means that you can guide someone towards something, but you cannot force them to do it. It implies that the person has the choice and responsibility to take action or not.

The idiom "a shot in the dark" means taking a risk or making an attempt without any certainty of success, especially when there are no other viable options available.