The number of installation workers required for a 300-square-meter light steel villa will vary depending on specific design and construction plans, construction progress, and project duration. Generally, the number of installation workers is influenced by several factors:

　　1. Construction Methods and Work Sequence: Different construction methods and work sequence will affect the number of installation workers. For example, modular assembly may require fewer workers, while on-site welding and assembly may require more.

　　2. Construction Period and Schedule: The length of the construction period and schedule will directly affect the number of installation workers required. A shorter construction period may require an increased number of workers to ensure timely completion.

　　3. Construction Difficulty and Complexity: The difficulty and complexity of the construction will affect the number of installation workers needed. If the design is complex and the construction is difficult, more workers may be required to ensure construction quality.

　　4. Safety Requirements: Safety is crucial during construction, and the number of installation workers may need to be increased to meet safety requirements.

　　In summary, the installation of a 300-square-meter light steel villa generally requires 7 to 8 installation workers. However, the actual number of workers needed may vary depending on the specific circumstances to ensure construction progress and quality.