Replacing window glass yourself is possible if you have the right tools, skills, and patience. Basic steps include carefully removing the old glass, cleaning the frame, measuring and cutting the new glass to size, and securing it with appropriate glazing materials. However, it can be challenging, especially for large or double-pane windows, and requires precise measurements and handling. Mistakes can lead to leaks, poor insulation, or further damage. For most homeowners, hiring a professional ensures proper installation, safety, and longevity. If you're inexperienced or unsure, professional assistance is recommended to avoid potential issues and ensure a quality job.