I know what you mean about being discouraged. There were some boss battles I had trouble with before finding out what combination of moves to use. It's not always easy to figure that out, given how many abilities you can learn, but I finally gave up on it after a battle against all the wizards. I couldn't even find much advice on good methods to use, and after several dozen attempts I gave up. With the way they tend to do their moves, there's a strong sense that the game is cheating. If I can ever shed some light on that battle, I might give it another shot, but I still beat the game and that's more important.
When you get a chance, be sure to get back to it. There's a lot in the story that you'll want to see and the ending will make you want to play the sequel even more.