In reply to Ben Callard:
Take a completely separate base camp - don't use your race tent or sleeping bag on the Friday night.
Don't go overboard with the lightweightness on your first time. Most people who DNF in the lower classes seem do so because they get wet and cold and miserable (and most people who DNF in the higher classes seem to do so because they take on a class that they aren't fit enough for). A decent, dry, warm night's sleep will give you more benefit for day 2 than an extra few hundred grams would slow you down.
Have a range of kit options and decide what to take based on the forecast.
Don't take too much food... There's only so much you'll eat on the hill, so don't go overboard with the number of cereal bars you carry.
Evening food that requires soaking rather than simmering will save you gas, but whatever you do don't be tempted to take a spare cartridge just in case - you shouldn't need it.
I know others go with the cup idea, but it's much easier to take a 300-500ml bottle and keep in at the side of your ruckack. It means you can drink regular sips when you need to, such as on a knackering relentless uphill where there is no stream, rather than gulp sporadically. I usually take a bottle of energy drink at the start then refill it with water and some kind of powder over the weekend.
Try not to worry too much about what other people are doing - just go as fast as you can and enjoy yourself. It will be hard, painful, hard, painful work, but it will also be one of the most rewarding things you've ever done when you reach the finish. Have fun!