I'm still a noob, and I still take time understanding stuff by doing research, but my biggest frustration before I found the courage to enter my first dungeon was tab-targeting. I didn't understand how to cycle and couldn't switch targets effectively that I had to use the mouse to click on the mobs. then I re-read the basic controls in the lodestone and realized that I wasn't pressing the A/button 1 to confirm my selection... :P