For some reason, on the B777 98% of the non-rated guys get killed during OE training.
In 2012 just 2 non-rated captains, out of many, made it all the way through.
The 777 still seems to be the darling-fleet, and experienced 757/767 guys seem to be not good enough to steer those.
It's a shame.
Best advise is to have a plan B or just don't go there at all if it's for the 777.