I took my borrowed Liber Usualis on the El today on the way to school to learn Sunday's propers. It took me about 20 minute to learn them all. That's a new record. Tthe first time I tried to read gregorian chant (On the first Sunday of Advent.) It took a whole week, plus most of Sunday morning.
Though, Now I have to learn the propers for the fest of the Conversion of St. Paul, as I learned the ones of the Sunday (Per Annum) rather than the feast.
Interestingly, the antiphons at lauds/vespers are extremely repetitive. They all begin EXACTLY the same way.