Next, consult the speaker's owner's manual and drill the series of holes you'll need to drive the screws for the speaker mount, if required. These hang on the wall like a picture and eliminate the need to cut speaker mounting holes - all you need is small holes to route the speaker wires. Hire a professional instead. This will go a lot easier if you enlist a friend to help tap on walls, shine lights, use glow rods, call out locations, and so on. This wire won't give off life-threatening fumes in the event of a fire, and it's designed to slip through tight spots easily.
Some brands even have convenient length markings printed on the insulation.
There will also be some way to distinguish the two wires paired in each cable - one side might carry printing or ridging. Its semi-rigid yet flexible construction lets you probe through inaccessible spaces and locate the desired routing and drilling locations. You can also use it to pull the speaker wire through by attaching it to the end of the tape. Then, cut a sharp point on the end of one with a pair of diagonal wire cutters and use it as a drill bit. For a floor plate, drill at a 45-degree angle right where the wall meets the floor until the insulation hanger breaks through.