The problem addressed in this study was the need for more professional and competent teachers to effectively implement a schoolwide SEL curriculum. The purpose of this qualitative exploratory case study was to examine teachers' perceptions, understandings, and experiences concerning their level of professional competence in implementing a schoolwide SEL curriculum. Additionally, teachers' levels of preparedness and the benefits and challenges of SEL implementation were explored. The framework for this study was the constructivist theory. Data collected occurred at one urban elementary school in the Palm Beach County School District. A purposive sample of nine participants participated in the study. Data collection occurred through semi-structured, open-ended interviews recorded using Zoom. Documents selected from the school district website supported the participants' responses. NVivo qualitative software transcribed the interviews. Inductive analysis elicited six themes aligning with the participants' perspectives on SEL implementation. Six themes emerged following manual coding from the transcribed data. The themes were teachers' knowledge of SEL, limited SEL training and implementation support, years of teaching experience improving SEL implementation, teachers' individual SEL level, time, scheduling constraints, and building relationships in the classroom. Participants needed adequate training to implement the district-mandated SEL curriculum into their daily schedules. A significant commonality among the participants was the need for more time in their schedules to consistently implement SEL each day. The findings provide awareness of teachers' knowledge of SEL, training, and implementation, and the perceived well-being of teachers towards the implementation process. Conclusions include a call for change by enlightening district and school leaders on best practices essential to secure a successful implementation of a SEL curriculum. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]