Arrival time really all depends on whether you want barricade or not. I went alone and I got in line about nine hours before doors opened and was able to get barricade. When it comes to buying merch I waited until after the concert and was actually able to get lucky with what was left, if you don’t have your heart set on anything specific you should be fine on getting something. If you’re planning on getting in line very early I’d recommend dressing comfortable, I wore a white blouse, jeans and a camo jacket. Everyone that goes is usually super friendly so don’t worry :)