Here are the quotations:
Ecclesiae de mysterio, Art. 6 § 2. "To promote the proper identity (of various roles) in this area, those abuses which are contrary to the provisions of canon 907 are to be eradicated. In eucharistic celebrations deacons and non-ordained members of the faithful may not pronounce prayers — e.g. especially the eucharistic prayer, with its concluding doxology — or any other parts of the liturgy reserved to the celebrant priest. Neither may deacons or non-ordained members of the faithful use gestures or actions which are proper to the same priest celebrant. It is a grave abuse for any member of the non-ordained faithful to “quasi preside” at the Mass while leaving only that minimal participation to the priest which is necessary to secure validity.
In the same way, the use of sacred vestments which are reserved to priests or deacons (stoles, chasubles or dalmatics) at liturgical ceremonies by non-ordained members of the faithful is clearly unlawful.
Every effort must be made to avoid even the appearance of confusion which can spring from anomalous liturgical practices. As the sacred ministers are obliged to wear all of the prescribed liturgical vestments so too the non-ordained faithful may not assume that which is not proper to them.
To avoid any confusion between sacramental liturgical acts presided over by a priest or deacon, and other acts which the non-ordained faithful may lead, it is always necessary to use clearly distinct ceremonials, especially for the latter."
Can. 1169 §2 “Any priest can impart blessings, except for those reserved to the Roman Pontiff or to Bishops.”
Book of Blessings (De Benedictionibus), no. 18 "The ministry of blessing involves a particular exercise of the priesthood of Christ and, in keeping with the place and office within the people of God belonging to each person, the exercise of this ministry is determined in the following manner:
a. It belongs to the ministry of the *bishop *to preside at celebrations that involve the entire diocesan community and that are carried out with special solemnity and with a large attendance of the faithful. The bishop, accordingly, may reserve certain celebrations to himself, particularly those celebrated with special solemnity.
b. It belongs to the ministry of a
presbyter or priest, in keeping with the nature of his service to the people of God, to preside at those blessings especially that involve the community he is appointed to serve. Priests therefore may preside at the celebration of all the blessings in this book, unless a bishop is present as presider.
c. It belongs to the ministry of a
deacon to preside at those blessings that are so indicated in place in this book, because, as the minister of the altar, of the word, and of charity, the deacon is the assistant of the bishop and the college of presbyters.
Code:
But whenever a priest is present, it is more fitting that the office of presiding be assigned to him and that the deacon assist by carrying out those functions proper to the diaconate.
d. An
acolyte or
reader who by formal institution has this special office in the Church is rightly preferred over another layperson as the minister designated at the discretion of the local Ordinary to impart certain blessings.
Code:
Other *laymen* and *laywomen*, in virtue of the universal priesthood, a dignity they possess because of their baptism and confirmation, may celebrate certain blessings, as indicated in the respective orders of blessings, by use of the rites and formularies designated for a lay minister. Such laypersons exercise this ministry in virtue of their office (for example, parents on behalf of their children) or by reason of some special liturgical ministry or in fulfillment of a particular charge in the Church, as is the case in many places with religious or catechists appointed by decision of the local Ordinary, after ascertaining their proper pastoral formation and prudence in the apostolate.
But whenever a priest or deacon is present, the office of presiding should be left to him."