First, it depends on how important calibration is to you: what is your budget to spend on time versus money for it?
Here are the options I see:
Free and under an hour or two: I agree the with previous post: you will find some good guidelines on the AVS owner thread of your TV, however I am sure there will be drift and variability between TVs of the same make, hence I say guidelines. This just takes time to track down suggestions and punch them in.
Cheap (under $40) and under an hour or two: You can use DVD or BluRay calibration disks (Disney Wow, Digital Video Essentials) during the configuration process to further improve any tweaks you want to make. Honestly, I think this would be fine if you're not a purist or discerning. If you are, then continue onwards...
For UHD, I believe Joe Kane's $150 USB stick at http://www.videoessentials.com/
is the only game in town today.
Next up: $100s of dollars and as many hours as you like. Use and master amateur/prosumer color calibration hardware and software. There are threads for that on AVS, I think we've seen imagic go down this path. Take a look at any of the other Display Calibration forums and ask there: https://www.avsforum.com/forum/139-display-calibration/
Finally, I agree not to put much stock in the Best Buy/Magnolia calibration service unless they are certified, but by who and for what?
ISF = https://www.imagingscience.com/
will give you a certified professional calibrator. I don't know what the pricing would be, but I'd expect over $100 a visit. Shop around for a quote to try it. These folks should be using professional calibration equipment (hardware and software that cost into the thousands of dollars?) which are a step above the prosumer and amateur stuff mentioned above.
Again, I believe a TV can drift and you may want to recalibrate every couple of years with any of the above methods.