You should hire a licensed electrician to install tamper-resistant GFCI outlets because it ensures safety (preventing shocks/fires), guarantees code compliance (passing inspections), protects your home's electrical system (correct wiring, balanced circuits), and provides long-term reliability, all while avoiding dangerous DIY mistakes like incorrect wiring or overloaded circuits that a professional is trained to handle.

• Safety & Shock Prevention: GFCI (Ground Fault Circuit Interrupter) protects against dangerous electrical shocks, especially in wet areas like kitchens and bathrooms. Tamper-Resistant (TR) shutters prevent children (and adults) from inserting objects into outlet slots, a major cause of shock injuries. Professionals prevent shocks, short circuits, and fires by ensuring correct wiring and grounding.
• Code Compliance & Permits: Licensed electricians know and follow the National Electrical Code (NEC) and local building codes, which often require TR/GFCI outlets in specific locations. DIY work can lead to failed inspections and costly violations.
• Expertise & System Integrity: They assess your home's system for overloaded circuits or outdated wiring (like aluminum wiring), which is crucial for safety and function. Correct wiring ensures circuits are balanced, preventing frequent breaker trips or overheating.
• Reliability & Value: Proper installation by a pro ensures the outlets work correctly and last, protecting your home's electrical system and value. 

• Installing code-required safety features (GFCIs, AFCIs, TRs).
• Upgrading circuits or adding new wiring.
• When dealing with older wiring or aluminum wiring. 
• While simple cosmetic swaps might be DIY-friendly, installing modern safety devices like TR GFCIs involves critical electrical work best left to a qualified professional for your family's safety and your home's integrity.