CCC 1669 Sacramentals derive from the baptismal priesthood: every baptized person is called to be a “blessing,” and to bless.1 Hence lay people may preside at certain blessings; the more a blessing concerns ecclesial and sacramental life, the more is its administration reserved to the ordained ministry (bishops, priests, or deacons).2
1 Cf. Gen 12:2; Lk 6:28; Rom 12:14; 1 Pet 3:9.
2 Cf. SC 79; CIC, can. 1168; De Ben 16, 18.