So, to reiterate, there is no particular change during Advent or Lent. I only ask since The Holy Rosary booklet by Catholic Book publishing includes the following:
The Five Joyful Mysteries Usually said on Mon. and Sat. [except during Lent] and the Sundays from Advent to Lent.
The Five Luminous usually said on Thurs., except during Lent. The Five Sorrowful Usually said on Tues. and Fri. throughout the year and every day from Ash Wed. to Easter. And, the five Glorious usually said on Wed. [except during Lent] and the Sundays from Easter to Advent. To someone new, perhaps you can understand the confusion.
Traditionally, the Joyful Mysteries are emphasized during Advent, and the Sorrowful Mysteries are emphasized during Lent. However, different Rosary books will express this emphasis in different ways, if they express it at all. And many people who say the Rosary are unaware of the Advent and Lent changes, perhaps because they didn’t use a Rosary book that had these changes when they were learning to pray the Rosary.
The “regular” weekly Rosary schedule for ordinary time (not Advent or Lent) is generally as follows:
Joyful: Monday, and also Thursday if the person does not wish to pray the Luminous on that day
Sorrowful: Tuesday and Friday
Luminous: Thursday, if the person wishes to pray these (some traditionalists choose to not pray the Luminous Mysteries)
Glorious: Wednesday, Saturday, and Sunday outside Lent or Advent
During Advent, the Joyful rather than the Glorious mysteries are said on Sundays in Advent. Some books, like yours, continue this all the way to Lent, and some go back to the regular schedule after Advent ends on Christmas.
During Lent, books usually take one of two approaches:
either say the Sorrowful Mysteries on Ash Wednesday and on Sundays in Lent and otherwise keep to the regular schedule; OR
say the Sorrowful Mysteries every day during Lent and resume the regular schedule on Easter.
It also goes without saying that if you’re celebrating some feast day relating to a Mystery, you may want to say the appropriate set of mysteries containing the feast day mystery on that day. Example: Christmas falls on a Wednesday but you might want to pray the Joyful Mysteries on that day because the Nativity is a Joyful Mystery and you are celebrating the Nativity that day.
HOWEVER, these schedules set by prayer books are just suggestions, not requirements, and as noted prayer books do not all list the same schedules anyway. The Rosary is a private devotion, and you are free to meditate on whatever mysteries you like, on any day of the year. Jesus and Mary are happy when you simply pray the Rosary and meditate on the Mysteries. They do not care if you choose to make up your own schedule, or meditate on the Glorious Mysteries on Monday instead of Saturday, or meditate on the same mystery on every decade you say for 3 months.
You can follow the schedule in your book, or simply choose what mysteries you want to meditate on each day. It’s your choice. But please do not stress about choosing the “correct” mysteries for the day.