I think they begin to feel easier because you become used to getting your *** kicked and slowly become a pro. I've been playing since Demon's Souls so they've been kind of easy since Dark Souls 2. I think Dark Souls 1 was the last time I got my *** handed to me by a Souls game lol. Bloodborne...
Tbh, you should play with each of them before you get hella far in the game. Be sure to familiarize yourself with the mechanics, lol rolling is gonna be your best friend too. For a starter though, if you wanna be OP go pyro but Mage is good for pvp. I usually go with the sellsword or something...