The Glorious Mysteries are prayed now on Sundays, then, Joyful Mysteries are prayed on Sundays of Advent, beginning Dec. 2 - Dec. 23.
Back to the Glorious Mysteries on Dec. 30.
Then, the Joyful Mysteries again from Epiphany (Jan 6, 2013) to Lent (Feb. 13, 2013).
The Sorrowful Mysteries are from Feb. 17, 2013 to Easter, March 31, 2013.
The Glorious Mysteries from April 6, 2013, to Dec. 1, 2013 (Advent).
I lead the Rosary for our parish at 11 AM Mass.
The changes only happen on Sunday for the Holy season. I hope this helps. Though, I imagine, you can alter to suit your own particular prayerful conscience.