When Jesus Christ was baptized He walked somewhere around 40 miles to get to John the Baptist. There were people who baptized right in Jerusalem, but He walked to John the Baptist because John had something that the others did not have . . . The Priesthood. The Priesthood is the Authority to act in the name of God. It is required to perform sacred ordinances. While anyone can go to a lake and perform a baptism, only those baptisms done by Priesthood Authority will be recognized by God.
Even after we are Baptized we still need to receive the Gift of the Holy Ghost. This is much like an upgraded conscience. The Holy Ghost is there to testify of truth, to comfort us(John 14:16), and to help us make good decisions. We can feel the influence of the Holy Ghost before Baptism, but the Gift of the Holy Ghost is when He becomes a constant companion, if we live worthy of His presence.
The Gospel of Jesus Christ is just that, His Gospel. We have to follow His plan in order to have a part in it. We cannot pick and choose which parts we like and which parts we don't. If we are to live again in the presence of our Eternal Father, we need to Endure to the End of all things.
So in order to truly be 'saved' you must have Faith in Jesus Christ and His atonement, Repent of your sins, be Baptized by someone who holds the Priesthood, Receive the Gift of the Holy Ghost, and Endure to the End.