2017 was my first year, and my first European Festival.
After decades of rain & mudbaths in UK & Ireland, I can seriously say "Why the fuck didn't we do this years ago"
Just to echo the comments previously made, comfortable shoes (concrete everywhere) & don't peak too early with the the drink ... You're on a different timetable at this festival.
I didn't enjoy the 2 Main stages, everyone too pissed & felt too far away from the stage ... But Every festival Main Stage is like that I suppose. Favourite Stages were Primavera & RayBan but that's how the bands fell for me.
We didn't find it cold at all at night, so maybe prepare for that on the first night, then judge for the rest of the week.