First if you find it too hard, frustratingly hard, I'm going to quit hard. If you aren't playing the lowest difficulty, change that first.
I will leave you with a tip: Yes it takes some figuring out at first, but there will be a large A HA! moment when it all starts to come together and you will improve a couple fold and then at that time, hope the game has a challenge for you left. The only exception I can think of is if you somehow really gimped your party, which is possible. But by the time Chapter 1 is over, you should have a good feeling with the system and start to know if your party is well made. If the party isn't, imo it isn't too late to re-roll and then you will go back over things you thought were crazy hard and laugh.
