You don't necessarily need to remove your baseboard to run wires behind it...most quarter-round has a flat clearance on the back of it, cut on a 45* so you could cover your wires with it in front of the baseboard. I ran my wiring UNDER the floor by drilling some holes in the floor near the wall where my TV/reciever is, then running the wires thru the joists from the basement, then back up into the family room(theatre).
The secret to making drywall jobs easy, is to use a wide taping knife to feather the joint compound out and minimize the sanding. Most people make the mistake of using a small putty knife and create all kinds of bumps and crevices in the compound that need to be sanded out and reworked. You should have almost NO sanding if you use the right knife.
