If you want to heal go white mage if you want to dps go machinist. Both easy to play. When healing what i did was just queue for dungeons normal don't use roulette. Pick lower level ones till you get comfortable and move upwards one at a time. Skip aurum vale unless you are doing it with friends, lol. Yes dungeons do get progressively harder starting with stone vigil. Some dungeon mechanics usually end up in other dungeons so if you are familiar with them it gets easier. Healer is a stressful job because you feel like if you mess up everyone will get angry at you. Just tell them you are new at the very beginning and could the tank please not over pull till you are comfortable. If have found when you are honest with the group up front before a wipe happens most people are cool about it. I had a friend that kept telling me "this isn't WoW", lol. It took a very long time to get over the fear of toxic attitudes from years of that game. Anyway, relax and have fun. That's what games are for. Hope you find your place here.