The law and the sacrifices and the blessings were all done through a system of a Priesthood,
remember? Jesus REPLACED the Priesthood. The Priesthood was acting as a mediator.
Jesus Christ became the Mediator, the Priesthood was no longer required because Christ
was and is, now able to forgive sins directly, no sacifices of animals required, and now we
have direct access to him, one on one. He therefore fulfilled and completed the Law.
No governing body acting like a "priesthood" required, no organization
recquired, no special earthily and heavenly classes required, just faith and grace and holy
spirit to become one in the body of Christ. No 100 page explanations required. Just faith.