I did my own but I was building the wall too so it was easy to run conduit. I used an articulating mount because I wanted to be able to swing the screen left/right and most mounts only have (a little bit of) up/down angle adjustment. I put an indented box in the wall behind the TV so I had a place to terminate the conduit and pull cabling; the box also included a power outlet.
My equipment is all on a rack in the back corner of the room. I paid a fair bit for a good enough, long enough, HDMI cable to run from the equipment to the TV. Don't skimp on that bit. And make sure your conduit can handle the cabling including that big HDMI connector. I also ran Cat6 because, well, why not. Plus I'm a bit nerdy about wired vs. wireless.
EDIT: Since you're handy, open the wall and run conduit. You never know what you might want to pull in the future.
EDIT #2: I used a Chief wall mount. Very, very, very sturdy.
https://www.legrandav.com/products/r...stability:Tilt
Here's a link to the recessed wall boxes; I used one with power conditioning.
https://www.legrandav.com/products/c...ssories/pac521