On the strength of having done my first enduro yesterday, I can offer the following advice:
1. Take more fuel than you think you’ll need; bananas, malt loaf and even energy gels all came in useful (as did beer, although not actually during the race)
2. Be ready for a good deal of climbing (and several miles of riding), although the race I did left enough time to push the steeper sections
3. The One Industries Mini Enduro events are really well organised and have a very relaxed and friendly vibe, with no rushing or pressure
4. The stages really do feel better when you’ve earned them
5. It was nearly the most fun I’ve had on two wheels (just behind the time when I managed 50 yards on two wheels in my Peugeot 205, although on second thoughts that one ended in a bigger crash, so maybe the enduro was better after all)
Hope at least some of that’s useful.