I re-wrote the Brothers in Arms guide because in my opinion it was not informative at all. My problem is my guide got stickied in the Japanese Brothers in Arms. So we need to somehow get it to the other brothers in Arms as well.. Just let me know if I can help out at all. And also in the guide there are videos but I didn't post them so if you could so kindly remove them.
Just make sure on your first playthrough you get as many of the non compulsive achievements done as possible, as some will be significantly harder on the higher difficulties. So yes, you can just enjoy those two playthroughs.
You can leave all the IC stuff till your compulsive playthrough as well if you want to.
The compulsive Guide contains everything that you need to know as far as missables stuff goes. However you will need to create every item in the game and for that you will need to do some searching around for were to get those items (just about everything you could possible need is already on the forums).
The chest guide is not needed at all, every chest that you need to open is also listed in the Compulsive guide.