I hate to give such a vague answer, but it's really as hard as you make it for yourself. It'll be a lot easier if you take the time to grind and master as many weapon, armor and accessory skills as possible.
Other than that, if you keep your level above the general enemies in the area, it won't be too hard. If you just try to breeze through the game without much preparation, it'll be tough
The game uses a FF6 type of learning system, where you get AP after battles that goes towards learning skills or abilities based on the armor or items you have on. You can use the skills while you have the equipment on, and when you master the skill, you keep the skill for that character. It's essentially the Esper system.
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