Yes the Pope is infallible by himself. Vatican I and Vatican II are extremely clear about this.
Four points are required.
He must be teaching as Pope, and not as a private theologian.
He must be intending to teach.
It must be concerning faith or morals.
It must be a teaching intended for the whole Church.
Unless one of these are missing, the Pope is teaching infallibly.
Thus, they are constantly teaching infallibly, even in their oral teachings.
Practices aren’t teachings. Thus they can be changed.
Examples are times of fasting, rules for fasting, prayers of the liturgy, etc.
Teachings, such as in the Roman Catechism, and the Catechism of the Catholic Church, and the teachings the Popes give in encyclicals are infallible and even when teaching orally, when meeting the above criteria, the Popes are infallible.
On the other hand, Catholic theologians and scripture scholars are never infallible. In fact, all heresies in the Church were started by Catholic scholars and even Catholic bishops. They cannot be trusted. Even St. Augustine didn’t trust whatever he wrote, for he submitted everything he wrote to the judgment of the Church. Even the Catholic Encyclopedia has serious errors. The Popes spend much of their time correcting the errors that Catholic scholars are constantly introducing.