The remarks of the Netziv can be extended to provide an approach to teshuvah. One's first thrust when doing teshuvah should be to improve in the spheres to which he feels a natural affinity. If his natural affinity is towards Torah study, his teshuvah should be to devote himself to improving the quality and quantity of his learning. The same is true of one who has an affinity to tefillah or chesed.
Once a person's teshuvah succeeds in matters that are near to you, in your mouth and your heart to perform it, he can take the next step. The mishnah in Pirkei Avos (4:2) says "one mitzvah leads to another mitzvah." A man comes to shul to daven Mincha. During the tefillah, he gives tzedakah to a poor perosn. After Mincha, he participates in a mishnayos shiur until it is time to daven Maariv. Thus, the mitzvah of tefillah led him to tzedakah and to Torah study.
Source: Sefer Darchei Noam Al HaTorah, by R' Sholom Smith, based on the teachings of HaRav Avraham Pam, zt"l