One of the common challenges faced by animators working with Toon Boom Harmony 21 is the learning curve associated with mastering the software. However, with the right resources and support, artists can quickly overcome these hurdles and unlock the full potential of the software. Online tutorials, user manuals, and community forums provide a wealth of information for artists to troubleshoot issues and refine their skills. Additionally, Toon Boom's customer support team offers expert guidance and assistance, ensuring that users can focus on their creative work without interruption.