On reaching Muzdalifah, join both Maghrib (Sunset Prayer) and `Isha' (Evening Prayer) at the time of the latter; three Rak`ahs for Maghrib and two for `Isha'.
If you fear that you may miss these prayers due to throng of people at Muzdalifah, then you may perform prayer on your way to it. Then when you reach Muzdalifah, you can sleep till dawn. But, women and unhealthy people may leave Muzdalifah to Mina after midnight.
Do not forget to take 7 pebbles to throw them on the first day of `Eid Al-Adha (Greater Bairam), and 21 for the second day, and another 21 for the third day, so that the number of all the pebbles would be 49.
Before the sunrise, go to Mina to throw the pebbles there.
Walk in calmness and keep on chanting Labbayk throughout the way.