Fire Emblem is a difficult series, I don't know if you guys have heard

[Words Of Wisdom]

Hyperion said:

FE7 isn't that hard, really. I suppose I"m used to Hard mode from the other games. I'm in chapter 16 I think and I haven't died yet. Is there a hard mode in this game as well?

When you play the game for the first time, it forces you to play Lyn (Normal) followed by Eliwood (Normal).

Later on, you will unlock 6 modes:

Lyn (Normal / Hard)
Eliwood (Normal / Hard)
Hector (Normal / Hard)

None of these are that hard however, if you check the pre-battle screen, it tells you your star ranks which represent how well you're doing in every category.  Getting a perfect ranking on Hector's Hard Mode is very difficult.