Leshem Yichud

Many have the custom to recite a short prayer known as Leshem Yichud before every Mitzvah, prayer, and Torah learning.

1. Some say that it is not obligatory, and, in fact, the Noda BeYehudah took serious issue with reciting Leshem Yichud. Nevertheless, one who can focus more intently on what he is doing by reciting Leshem Yichud prior to the action or prayer should do so.
2. One should be careful not to pronounce or even spell out the Shem Havaya in the text of the Leshem Yichud.