I am wanting to replace my oh so nifty aluminum wiring in my 40 yr old house. One question I haven't been able to get resolved is about running the new wiring in the walls. When I fish the new wire into place, do I need to anchor it to the studs within the 8-12 inches of the box? If so, are there any tricks to doing it other than opening up the wall to get access to pound in a staple? Another question is do I need to pull out the old wire. I'm sure I should, if nothing more than to just make sure there isn't any confusion created in future projects when someone comes across a wire and can't figure out where it goes, etc. Thanks for any info or suggestions.