Kol Nidrei
Before Kol Nidrei, say kapitlach 115–123 of Tehillim. Additionally, if you have enough time, say viduy (Ashamnu, Al Chet, etc.).
Say Kol Nidrei along with the chazzan—quietly, but loud enough for those standing next to you to hear.
After Kol Nidrei, the chazzan says the berachah of Shehecheyanu slowly. The congregants say the berachah quickly, so as to finish before the chazzan does and answer Amen to his berachah.
Those who said Shehecheyanu when bentching licht should not say it now.
Maariv and Rest of Evening
When reciting Shema, say Baruch shem etc. out loud.
Shemoneh Esrei is followed by selichos. Selichos are followed by Avinu Malkeinu, L’david mizmor, Kaddish Shalem and Aleinu.
After davening, men say the first four kapitlach of Tehillim, having in mind the nonstandard nekudos of Hashem’s name as printed in the Machzor. The Rebbe instituted the custom of reciting the entire Tehillim after Maariv.
When visiting the restroom after Maariv, touch something unclean so you will be able to wash your hands (until the knuckles). However, when visiting the restroom before Maariv or on Yom Kippur day, you may wash your hands (until the knuckles) even if you have not touched anything unclean.
