Sweet. Only got about ten hours left now and it's bedtime, so that's handy. Can't wait to play the game properly again.
One thing I dislike about the game is getting loads of items/ammo on lower settings, then losing loads when you go onto proper difficulty settings I don't expect to get the Big Boss emblem any time soon, but Extreme is so much more enjoyable to play in the mean-time.
Big Boss emblem isn't as hard as you might think. There is a really handy trophy guide on one of the ps3trophy sites that gives you an easy to follow walkthrough.