We cannot "get" him; we can only let him get us. He is God. Only God can give him. Christ gives him. He comes from the Father through the Son...I think we all get to feeling so "familiar" with God that we forget who we're dealing with sometimes. That's why I like Rabbi Hershel's reminder, "God is an earthquake."
The Spirit is free. He is God's gift. There is nothing we can do to "get" him; we must simply ask, in faith, like a child trusting his father's love. That same is true of the Spirit's gifts, such as wisdom: we get them simply by asking and believing: "If any of you lacks wisdom, let him ask God, who gives to all men generously and without reproaching, and it will be given him. But let him ask in faith" (Jas 1:5-6).
But be careful what you ask for, because God will take you at your word. The Spirit's job is to sanctify, to make saints, and saints are not safe! They are like the One who makes them. God is not safe. Rabbi Abraham Heschel says: "God is not nice. God is not an uncle. God is an earthquake."
Catholic Christianity:A Complete Catechism of Catholic Beliefs based on the Catechism of the Catholic Church by Peter Kreeft