Definitely have a go on your current bike / borrowed one before investing. I did a couple of enduros this year and beforehand I was certain I’d love them and this would be the thing for me forever more. I’d saved up a deposit for an gnarpoon and was already to pull the trigger.
As it turned out, after two races I went home downbeat and decided that actually this wasn’t what I wanted at all. They were both really well organised and the trails were varied and challenging, but the idea of riding my bike for a total of about half an hour and pushing it back up the hill the rest of the time suddenly seemed alien and wasteful to me. It made me realise I actually wanted adventures, proper hills and days out, so got home and spent the deposit I’d saved on some riding weekends and new wheels for the little 120mm 26er full sus that is perfect for the vast majority of my riding.
So, in amongst my waffle, I’d recommend doing one first, even if its on a hardtail. They are full of really friendly, smiley people having a hoot who will be more than happy to chat about their bikes to you too. I spend most of one of the races gassing to a chap on a Bird Aeris, which I was very jealous of and looked just the job for Enduro. I’d check one of those out if the money is burning a hole in your pocket. He said their customer service was great and they were more than happy for you to test ride at Swinley Forest.