Refactoring a large, untested class can be daunting, but the developer community offers several strategies to tackle this challenge effectively. First, understanding how the class is used by running it can provide insights and facilitate the creation of initial tests to ensure safe refactoring. Narrowing the scope by focusing on problematic areas and applying the Pareto principle can make the process manageable, as often only a portion of the class needs immediate attention. Breaking the class into smaller, logically grouped components can improve both structure and understanding, while enhancing code reading skills through techniques like visualization and summarization is also crucial. Resources such as Michael Feathers' "Working Effectively with Legacy Code" and Brett Slatkin’s video on refactoring Python provide further guidance, and community collaboration can be invaluable in navigating such complex tasks.