Ridiculously easy depending on what class, skills and runes you use, and what drops you get. If all you get is shit gear then it's not going to be easy regardless, and quite possible too considering the extreme randomness of diablo drops.
This really shouldn't be an issue on normal - something's not right...
BTW, this comment isn't about being a good or bad player but simply ytouy shouldn't be dieing much on normal since it's essentially a tutorial for the game. Aside from the very end bosses which could catch you out if you stand in their abilities for too long and the odd pack which could surprise you most mobs should die pretty easily. I bet there's a decent percentage of people who went through normal without dieing once - anything more than 50 deaths for the whole playthrough must be pretty unusual. More than say 20 would be a bit of a surprise tbh.
Only thing I can think of is you've missed something fundamental...
1) Do you realise you can drink health pots (bound to Q iirc).
2) You can hire helpers in the starting area of each act - they come with you and fight for you/heal you during single player. If you dismiss them you'll have to re-hire them.
3) You can equip items not only on your character but also the person you hire.
4) Your free signature ability/spell (left mouse button) is reasonably good. You don't need to rely on the other expensive spells/abilities and then wait for your magic/rage/energy to refill before you can attack again.