This paper explores the concept of instructional leadership and principals' perceptions of the practices of instructional leadership. Despite the emphasis on the effects of school leadership regarding teaching practices and learning outcomes, research on direct instructional leadership is scarce. It is focused either on identifying overall leadership practices or on measuring the effect of various intangible school level variables, such as school climate, on student learning. The concepts related to instructional leadership are ambiguous and vague, and challenged by contemporary understandings of school leadership (transformative and distributed leadership). The data consists of narratives written by principals from Norway, Sweden and Finland on successful and unsuccessful efforts of guiding teachers' work in the classroom. These narratives are used for enabling principals to communicate their experiences of the complexity of interacting with teachers in instructional matters. A theoretical framework of practice architectures is used to elucidate the material, discursive and relational aspects of instructional leadership. A three-step analysis of the data suggests that successful instructional leadership is characterized by solidity, co-production and direction. Interestingly, principals' narratives on instructional leadership lack an explicit vocabulary of didactics, examples of face-to-face guidance of teaching as well as direct professional relationships for strengthening teaching practices.