There are no specific qualifications necessary; but for a person to gain freedom, he or she must be honest and desire to be free, and willing to submit to God’s word. It is ideal if the person is a Christian, ready to deal with sin and repent, and if applicable, willing to be transparent and honest about the places that are hidden that he/she would not want anyone to know about. The person must be willing to forgive others and let go of judgment. He/she must want freedom and not just relief.
Being under clear church authority and accountable to members of the church is also helpful. Finally, one should expect God to lead the prayer time and open to the leading of the Holy Spirit, without false expectations or prejudicial notions of what should occur.