How would it be too hard? It may take quite some time but the journey through each game will be good. I've beaten the main series, excluding FF XI , mostly twice (FF XII and FF XIII only once). I would say it is worth playing through each game because the Final Fantasy series has loads of memorable characters, scenes, & music with unique growth systems. I say give each game one go around as each game offers something good/great.

Don't give up ExQ (Carlos Spiceywiener)!!!!!