I know where you're coming from bud. I love the game though (I'm a sucker for difficult games!), and it took me a while to get the hang of.
I'm not sure if it's still available or not, but there was a free DLC whenever it came out. I downloaded it and played the battle over and over and levelled up all of my characters significantly and it helped a lot. It took a lot of time, but it was well worth it.
ALSO...
Make sure to 'join' characters during battles. I usually found that if I took a powerhouse-character and synced them with a Pegasus Knight, I would have a pretty powerful character that could traverse great distances and deal a decent amount of damage.