| Scenario | Recommendation | Rationale | | :--- | :--- | :--- | | | DIY Suitable | Low risk, easier to handle, lighter weight. | | Double Pane (IGU) | Professional Recommended | IGUs are heavy, sealed units. Improper installation can compromise the seal immediately. | | Upper Story / High Rise | Professional Required | Extreme safety risks; requires scaffolding or specialized ladders. | | Broken Tempered Glass | Professional Required | Tempered glass shatters completely; removal is hazardous and tedious. |