Chapter 22 – Tahanun (Petition of Grace)
22.1) Rest your head on your arm when reciting the Shemoneh esreh (eighteen; silent prayer) and the tahanun (petition of Grace).
22.2) Rest your head on your right arm at morning service and on your left arm at Minhah (prayers offered in the afternoon).
22.3) The rite of resting your head on your arm is performed while sitting; but, if you have to, you can rest it while standing.
22.4) The rite of resting your head is performed only where the Scroll of the Law is found.
22.5) Do not recite the tahanun during the seven days of mourning for a death or in a house where a death has occurred.
22.7) Omit the tahanun in a synagogue when a bridegroom who has never been married before is present during the seven days of the bridal festivities.
22.8) Omit the tahanun on certain days (See source for full list, or consult a rabbi.)
22.9) Read the Vehu rahum on Monday and Thursday, as they are days of Grace.
22.10) The half-kaddish (a hymn of praises to G-d) is to be read after the tahanun on Monday and Thursdays.