The answer to 'how to install an electrical panel' is that installing an electrical panel is a complex task that is best left to a licensed and experienced electrician. Improper installation can be extremely dangerous and lead to electrical fires or other hazards.
While some basic electrical work can be done by a homeowner, installing or replacing an electrical panel requires specialized knowledge, tools, and permits. An electrician will ensure the new panel is properly sized, wired, and grounded to meet all local building codes and safety standards.