I've heard so many good things about this game. Sounds like an essential 3DS game.
I haven't played any Fire Emblems before. I don't know the first thing about them. How accessible is this game to a newcomer?
Awakening was my first Fire Emblem game too. The best way to go into it is to think of it like chess. It's a strategic game and the field is a chess board. Your characters are the chess pieces, and you move a certain number of spaces depending on their moving capabilities and the terrain. I'll explain it all right now in a way that I wish I found when I was starting out.
The chess pieces have HP. Rather than being able to take a chess piece, you attack a character. Like Pokémon, or any other RPG that you can possibly think of.
Starting out, you're given the difficulty option, and the option to choose casual play or classic play. In classic play, if you lose a character in battle, they're gone for good and you can't use them ever again. In casual, this consequence doesn't exist.
The main characters - Chrom and your avatar - are the king. If they're killed in battle, then its game over for you. You have to reload the save file. Thankfully, the game prompts you to save after every battle you have.
You're given certain objectives for the game. Sometimes you have to kill the entire other team. Sometimes you just are required to kill the general. The objective is always shown right before you're able to move the pieces.
You can pair up your pieces to strengthen them. They also have support systems, where if your characters have higher support, then they're more likely to help each other out. Blocking blows, attacking as well, etc.
Your characters have stats, and abilities that they're able to learn after they level up. They have classes that give them unique powers and dictate what weapons they can use, like healing, magic, bow and arrows, and shapeshifting.
Your characters can change classes after level 10, and they can also be promoted at level 10 as well. There are two ranks to each class, and different possible choices for some of the base class for which way you want to go. Each class has their own mostly unique set of abilities. The abilities help you out. One ability for example allows you to make another move after you kill a piece on the enemy side. That's usually taken as the most valuable ability. You can change classes as many times as you like, and you can essentially pretty much collect nearly all of the abilities available on the game, with some restrictions based on gender and Lords (there's a Lord rank in which only Chrom and his child can access) and your starting class - which I forget the name of.
The support system I mentioned earlier has four ranks, depending on who they are. C, B, A, and S. When some characters reach the S rank with an opposite gender (they can only reach an S rank with an opposite gender character), they'll unlock a prologue. A side quest in which their child is accessible to be recruited. Sort of like Pokémon, their child inherits their parents abilities (they inherit the last slot ability of both parents).