How hard would it be to unhook and replace the plugs in the walls - not the whole box, but the part you see through the cover? Our plugs may have once been white but are definitely yellowed looking and I want to replace all the outlet covers and actually plastic plugs so they'll match the white trim in the rooms instead of looking dirty. I've got zero electrical experience, but my fiance knows enough to replace light fixtures without incident, so I'm guessing he could do this and probably show me how as well? Any website w/how-to's would be appreciated, I'm trying to be a Ms. Fixit rather than a Ms. Wait for the Man to Fixit!