We receive the Holy Spirit through Chrismation (aka confirmation), and if we cooperate with Him we can foster the fruits of the Spirit which we need to become holy and to get away from sin so that we can be saved. But the gifts of the Spirit can never save us apart from the regeneration of our spirits in Baptism, and the eternal life & patricipation in the divine we receive through partaking of the Eucharist and having His flesh mingle with ours.
It the OT, when a person sinned they had to offer a sin offering. They'd put thier hands on the animals head and confess their sins before the priest, so transfering them from themselves to the animal, which then receved the consequence of sin, death, in their place as it was slaughtered.
In the New Testament we confess our sins to the priest, and they are transfered from us. When the priest starts the Mass, the sins are transfered to the new testament lamb, to Christ at calvery, and then we partake of His life-giving flesh just like in the Old Testament the person would eat of the sacrifice they'd just offered.
It's bye this combination of Baptism, Confession, and Eucharist that we receive the forgiveness of sins from God. It is by partaking of the Body and Blood that we participate in the divinity are receive grace to be holy.
The working of the Holy Spirit who we receive at Chrismation is also key to the process, as He convicts us of our sins and encourages us to confess them and receive Communion that we may be forgiven. He also gives us grace to foster the fruits of the spirit, and this grace along with the grace we receive through Communion is what allows us to be holy if we cooperate and make spiritual progress.
The way we receive the Son and the Spirit is distinct, just as the two persons are distinct in the Trinity, and the working of the two in us is similarly distinct, while at the same time there is no act done by one that does not involve all three persons. For at Communion it is the Holy Spirit who descended and turns the bread and wine into the Body and Blood, and in Chrismation it is Christ who sends us the Paraclete, as at Pentecost.
It's very important to understand that neither of these two ways we receive God into our lives are equivalent or even parallel to the Protestant notion of asking Jesus into your heart and getting saved. I don't know if you're looking at it from that viewpoing and trying to translate things to make sense, but if you are, just give it time and you'll more and more live in the Catholic theological system rather than the Protestant one, and these things will start to make more sense to you.