Referring to those seven tasks of GDC 233 ….
234. All of these tasks are born of the conviction that the quality of any form of pastoral activity is placed at risk if it does not rely on truly competent and trained personnel. The instruments provided for catechesis cannot be truly effective unless well used by trained catechists. Thus the adequate formation of catechists cannot be overlooked by concerns such as the updating of texts and the re-organization of catechesis. (General Catechetical Directory 108a)
Consequently, diocesan pastoral programmes must give absolute priority to the formation of lay catechists. Together with this, a fundamentally decisive element must be the catechetical formation of priests both at the level of seminary formation as well as at the level of continuing formation. Bishops are called upon to ensure that they are scrupulously attentive to such formation.
Good. People–competent people–are essential. Having the message, even the most pure and perfect message is far from enough. You need the messenger to communicate it.
Equally good is the need for continuing formation of catechists. Even clergy.