This article reports the results of an introspective research conducted by a student-teacher and her advisor. Both met regularly over a period of one year and a half as part of the student-teacher academic work for the Research I class. As a result of their conversation the student-teacher and her advisor decided to document the former's experience during her teaching practicum as she was trying to implement an innovation using m-learning in a public school in Bogotá. The analysis of data (narrative introspection, introspective interview, and lesson plans) shows that the student-teacher lived her teaching practicum within dichotomies in three dimensions we named "negotiating between epistemologies," "making up for logistic/technological flaws," and "mending the self: between frustration and achievement."