Whoever catches up with the imam when he is bowing, and bows with him, that is regarded as a rak`ah for him, according to the view of the majority of scholars, even if he did not recite al-Fatihah.

According to the majority of scholars, the 4-Rak`ah Sunnah prayer should be performed in sets of two, with Taslim after every two Rak`ahs. This ruling is based on the Hadith where the Prophet said, "The prayers of the day and night are to be offered two by two."

There is nothing wrong with reading du’a al-qunut from a piece of paper or a booklet in Witr prayer until one is able to memorize it. It is not obligatory for the du’a of Qunut to be in the words narrated from the Prophet.