The "Federal Pacific" electric panel is a known fire hazard. The panel has known design and manufacturing defects. I have inspected homes that have caught fire from these panels. If you have one in your home, this panel should be replaced by an electrician.
The point is that a good electrician can keep disruptions to your house at a minimum. By drilling discrete holes in top and bottom wall plates and using fish tapes to route wires through wall and ceilings cavities, most of what has to be done to accommodate new wiring can be hidden.