Many of the answers here get the First Amendment, and very likely the rest of the Bill of Rights, backwards. The First Amendment does not grant or protect rights. The right to speak, assemble, the right to worship (or not), or to petition the government for redress all predate the Constitution. The First Amendment recognizes those rights. read more
The first is by changing the Constitution, specifically repealing the Second Amendment. While changing the Constitution and repealing an Amendment has happened in the past with the repeal of the Eighteenth Amendment (Prohibition) in the Twenty-first Amendment, I don't think this is going to happen. read more