I need to upgrade the wiring in my home. It's braded resin stuff now. The wiring is insufficient to run all our appliances, and is a fire hazard. The walls are plaster and lath. What's the best way I can cut some of the cost? Anything I can do that I don't need to pay an electrician for is best (obviously). Note: I still want a master electrician to inspect my work, and hook everything up to the box.