I'm so happy for you! I went a few years ago and my main advice is to not get caught up in recording it. I'm not saying don't take any videos, I'm not even saying don't record every song (I sure as hell am doing that lmao) but actually try to look at them rather than the video you're getting, if that makes sense. Live in the moment, even if you're actively recording memories of the moment that you can actually look back at.
Also, don't forget that there's almost a 100% chance that every second of that concert is going to available to find in videos online so if you don't get a great video of something, don't fret too much; it's out there somewhere, you'll still be able to find it.
And have so much fun~!!