i entered 3 of the UK gravity enduro series this year, the first competitive events that I have done.
the standard is pretty high and I was consistently in the bottom 3rd of my class. It didn’t matter too much though as the main day is seeded so I found myself racing people of a similar ability. I tried to warn people behind me on the seeding runs that I wasn’t that fast and I hope I made a decent job of just letting people past when I held them up. In summary if you are reasonably competent I think you can give it a go.
re: advice, you need to be fit enough to ride a 40 k loop on 2 successive days and still have enough energy to go for it on the descents. some uplift days helped me get my eye in on the more technical stuff as well.
a dropper post is pretty much essential if you want to be competitive as some timed stages have fire road sprints in them.
don’t go too lightweight on tyres, i saw a lot of people whose race was ruined by punctures and in the last race I was glad I opted for 2.5 USTs to give a bit more security on the sharp rocks.
Make sure you arrive on the Saturday in plenty of time to do the full loop as a practice, riding stages blind while racing was a disaster for me.
enjoy ! maybe see you at a race in 2013