Haha, I've played around with a Mii on the Wii like that before; we gave him tiny eyes and spread them far apart. Oh man, I couldn't breathe due to laughter!
It is a pretty challenging game, especially when compared to Path of Radiance and Radiant Dawn. At least on Hard mode. I feel like the hardest chapters are more concentrated in the beginning of the game, specifically Chapters 5-7 (the chapters where you get Ricken/Maribelle, Gaius/Panne, and Cordelia) and maybe Chapter 13 (Henry). Aww, you didn't play Classic? Haha, that's the only way I play, since it's been like that since my first Fire Emblem, FE7. I don't believe you can save in-battle in FEA, so if someone dies, you either have to go on without them or restart the entire chapter. But maybe that's a Hard mode thing?