Do not act unless you are called by the Holy Spirit
In this passage it states that only skeva and his sons were attacked yet it had to have happened before
Acts 19:13Complete Jewish Bible
Then some of the Jewish exorcists who traveled from place to place tried to make use of the name of the Lord Yeshua in connection with people who had evil spirits. They would say, “I exorcise you by the Yeshua that Sha’ul is proclaiming!”