Assuming your digital cable box, dvr, surround sound reciever is like 2 or 3 feet under your tv its easy. I hope people in this thread didnt pay $300+ to fish a wall 3 feet
If your components aren't directly underneath you have to go up from the tv into and attic and down, or up from the basement. If you have a 3 story house and the tv is on the 2nd floor thats gonna be some work.