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One traditional way to prepare is to study Pirke Avot (that portion of the Talmud devoted to ethical wisdom) throughout the period of counting the Omer. In recent years some beautiful complementary materials have been created. Thank you to Yael Raff Peskin for curating several of these resources at her blog, Omer Harvest. One of the seminal modern resources is the flipbook (old-school on paper) crafted by Simon Jacobson. He offers daily meditations, questions, and exercises that encourage self-reflection based on the so-called "lower" seven sefirot.
There have been years when the 49-days of self-reflection have been intense. When my tendency to self-critique swallows-up my sense of self-realization. At those times I recognize a need for self-compassion at the end of the Omer.