On kit it's important to make sure everything is in top condition before you start (someone on here gave me that tip and it was a good one). Take recovery drink.
For training like the man says lots of riding under your belt. Not sure you have to do lots and lots of 6 hour plus rides but certainly quite a lot of longer days in the saddle. About 2 weeks before I had a period of 5 days when I did some hard training everyday, some long rides, some intervals, some spinning – seemed to give me a good prep for the TW.
Also if you want to do well in the racing aspect, you'll want to get super quick over 15-30 minutes, cos all the special stages were that kind of length and most had big forest climbs on them too. Quite hard doing the racing because you have to turn up the pace dramatically compared to the rest of the time.
This year was a classic. One of the best things I've ever done.