Lots of differing opinions / contradictions on this.  I recently got a 65" C7 and haven't used any break in slides. I did use them with my Panasonic VT65 plasma but that was out of fear :)

I think just use it, make sure you don't have anything with static image on for longer than 2 hrs you should be fine.  Ensure you leave the power on when the TV is in standby, as it seems to run its own maintenance cycle for removing static images after 4hrs of cumulative watching time.  It can't do this with no power.

There is also a manual option of starting the cycle in the menus.

make sure your channel or program you're watching doesn't display their logo :) or strips of breaking news :)

I would go with JaBZ. I have a 65" C7 and have put full screen 1.78:1 movies on repeat eg Lion King Blu-ray etc over its first few weeks. I still watch various widescreen movies,TV and Sky Sport and havent had any issues over the 3 months i have had it. I havent done any gaming on it so cant comment on that scenario. I had a few ST series Plasmas and had no retention/burn in issues with them. By the way i use the ISF Dark picture setting for most(UHD) watching. 

Thanks guys.