The DRE, in this example, is clearly the person who knows what should have been done and what did not work. Liturgy, like most ministries of the church, is somewhat indestructible. No matter how badly we mess it up, the assembly still seems to find a way to pray. So, while the DRE may hope for better things next time, she can begin by acknowledging what worked. By staying within her own boundaries and focusing on the positive, the DRE can begin to build a trust relationship with the liturgist.
Nothing is more important.
Then, once a secure relationship is established, the DRE might be able to serve as a mentor to the new liturgist, guiding him to the proper coursework, commentaries, and concepts about liturgy. It is important to point out the difference between turf wars and creative tension. In an ideal world, all ministers on the team are fully competent to do their ministries. That does not mean there will never be conflict. But the conflicts will be those that are bound to happen when everyone feels free to share his or her ideas, hopes, dreams, disappointments, and fears.