The FIRE concept is a very interesting financial concept. I am currently reading many articles on this topic.

The main difficulty faced by a person who wants to achieve financial independence is how to earn the initial capital. Very often, a hired worker receives a salary that is enough only to cover current expenses (rent, utilities, travel to and from work, food, shoes, clothes, simple entertainment).

Meanwhile, for the purposes of the FIRE concept, income must significantly exceed expenses. Because it is net profit that is the source of funds for investment.

That is, an apologist for the FIRE concept must either become a highly qualified and highly paid employee or the owner of a successful business. Both tasks are quite difficult.