How does someone become a justice on the?

First, the President must nominate someone to become a Justice on the United States Supreme Court when there is a vacancy. Then, the Senate must confirm the nomination with a majority vote.

Explanation:

There are no qualifications listed by the Constitution for becoming a Justice. The only steps one has to go through is the nomination and Senate confirmation.

However, in practice, having experience in law is a requirement as all previous Justices have been trained in law, even if they didn't go to law school.