The answer to 'how to replace electrical panel' is to hire a licensed and insured electrician to safely replace your home's electrical panel. Replacing an electrical panel is a complex task that involves shutting off power, removing the old panel, installing a new one, and connecting all the wiring correctly. This is not a DIY project for most homeowners due to the electrical hazards involved.
A professional electrician will ensure the new electrical panel is properly sized for your home's electrical needs, up to current safety codes, and installed correctly to avoid issues like electrical fires or shocks. They will also properly dispose of the old panel and ensure your home's electrical system is functioning safely and efficiently.