The Baptism of the Holy Spirit is just one of many terms that describe an experience that Christians have all throughout the book of Acts. It is an experience that Jesus defines as a "clothing with power" in order to fulfill the commission to be His "witnesses in Jerusalem and in all Judea and Samaria and to the end of the Earth." It is an experience with the Holy Spirit that results in extraordinary power to be God's witness. If you feel that you lack power as a witness, don't seek the newest tactic or technique or book, pray and ask God to clothe you with power by the Holy Spirit.