Posted: 23/09/2014 at 10:55
I was going to mention the mental side, but I'm not sure if that's something you can prepare, or even get through experience
I have seen people just "crack" and retire, even though there's probably not too much wrong with them
what I try not to do is think about how much is left to the finish, just about the next section to the next CP...
if you've recce'd the course though, you should have a good idea of the "extent" of the challenge, so it shouldn't come as so much of a mental "shock"
it also help with pacing (one of my points)