I booked tickets to see Knocked Loose in Paris on a whim because an opportunity to see a band I had grown to love last year on my 25th birthday felt too good to pass up. This was my first metal gig, I hope I go to many more, it was extremely enriching and cathartic. I chatted to a British couple, turned it was one of their birthdays too. They were more experienced metal fans and talked me through what would happen and who the support acts were.
So yeah. Go get it out of your system. My neck does hurt now.
OH OH sub recommendation: if you're not already using ear plugs at gigs, start.