Break it down into small projects.
Mounting the TV - Find the appropriate mount. Fixed, tilt or one of those neat swivelly ones. Mark the spot on the wall for it. Does it have proper support beind the drywall? Add some. Yes, you will have to cut holes into the drywall and nail, screw, glue bracing to the wall studs but that is an excuse for tools. Attach the mount to the wall. Hang the TV on the mount.
Now that you have watched TV with wires hanging down the wall, you can start to hide them. Do you have a basement below or an attic above you? Are any of your walls exterior? Are there any door ways in the shortest path of the wires?
I'm an IT guy by trade. I take home theater and especially wiring jobs as a challenge. For example, I installed the wiring for my cousin-in-law's DirecTV. I had to use a ladder in his attic to climb down behind his son's bedroom and on top of the master bedroom on the first floor. I then drilled the hole to run the coax with a 1" paddle bit 7" inches long. My hole didn't go all the way through the boards so I added my 12" extension. I drilled and drilled. Still didn't break through. Off to Wal-Mart for another extension. I ended up with a 31" drill bit that finally broke through the thickest top plate I have ever encountered. But I ran the cables. The next day with the satellite installer came, we was amazed at what I had done. He even called other installers to stop by and take a look.
Every time I hit a road block, I found a solution.
-Robert