According to the Levush Selichot are modeled after davening, we begin with Pesukei D’Zimra, then kaddish, then the thirteen middot and selichot (which parallel the amida), followed by Tachanun and full Kaddish. What are the halachic ramifications of this?
The minhag is that the one who davens Selichot should daven the rest of the day because “המתחיל במצוה אומרים לו גמור”. Why are Selichot and Shacharit/Mincha/Maariv considered one mitzvah?
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Shiur provided courtesy of Torah Anytime