Copycat, it matters in that in some parishes, you will get training in the whole Catholic faith, whereas in others, you will be taught, well, all of parts of the faith. It will take some fortitude on your part, but allow me to suggest that you gently put your proposed instructor to a sort of litmus test proposed a few years ago by Fr. Joseph Fessio, S.J., the founder of the Ignatius Press publishing house. Fr. Fessio was mainly talking about candidates for positions of authority in seminaries and others in charge of the spiritual formation of others, but it applies equally well here. Fr. Fessio proposed:
"No one shall be given a position of authority in the Church, including admission to sacred orders, religious vows, appointment as a superior, or director of formations, who does not willingly accept and publicly defend the following three items from the Catechism of the Catholic Church.
Number 1577: ‘Only a baptized man (vir) can validly receive sacred orders. For this reason the ordination of women is impossible’
Number 2357: ‘Basing itself on Sacred Scripture, which presents homosexual acts as acts of grave depravity, the Church has always declared that homosexual acts are intrinsically disordered and under no circumstances can they be approved.’
Number 2366: ‘The church teaches that each and every marriage act be ordered per se to procreation of human life.’ Humanae Vitae is the truth, and artificial contraception is an intrinsic evil.]
“No one shall remain in authority in the Church who does not promptly employ all the means at his disposal to ensure that those under his authority accept and defend these propositions.”
“These are the controversial issues of our time,” said Father Fessio, “the issues that arouse the opposition, but which the majority of theologians in this country do not accept to be true. … How are we going overcome this crisis of truth if we continue to allow people who do not accept the Church’s teachings on these central issues to continue to represent the Church?”
Fr. Fessio added, “You can ask any priest or bishop about three items in the Catechism and if they wholeheartedly support and defend those paragraphs, it’s very unlikely they dissent from Church teaching on anything else.” For the full context in which these remarks were made, go to: catholiccitizens.org/press/pressview.asp?c=2049
The point is, loyalty to the Magisterium varies from place to place, so choose carefully. God bless you!