Amalur really doesn't have a particularly steep difficulty curve, if you have any trouble back track and level up a little more, I did pretty much every side quest as i went along and had completed all faction quests except the travelers before making my way to the final area, by which time i was level 38.
I would suggest investing in the Black-smithing and Sage-crafting skills as well as alchemy and detect hidden. Armour and weapons made though black-smithing will almost always be better that what you can find, especially if you are using high end gems crafted though your Sage-Crafting skill
My build was as a Sorcery / Finesse Hybrid, this worked out very well, I used poison and burning damage on my weapons (Faeblades and Chakrams) the reason being is poison status effect cuts the damage opponents deal out by 50% and fire will fear most enemies after while which allows the S/F hybrid to generate criticals the entire time which also regenerates your mana. I also used the sustained abilities Envenomed edge (upgraded as far as Mysterious toxins) from the finesse tree and Sphere of protection from the Sorcery tree these help reduce the amount of damage you take from your opponent.
For the final boss fight you can only damage the boss while in reckoning mode, Take lots of Fate potions (4x essence of fate to make) these will fully replenish your reckoning meter instantly making the fight a lot shorter as you wont have to generate fate off of the ghostly replicas of yourself that the boss creates. These replicas will use the same weapons and abilities as you do.