Laura, I do believe I'm disciplined enough to cancel if I'm too tired. I have to admit though to finding it difficult not to race once I've started. I find it hard to run easy, if there is such a thing, in a race situation, especially if fully fit. I would rather not run in a race if I was going to do training pace.
Obviously sometimes we experience bad runs in races and some races are more of a struggle than others. I might be lucky to actually feel happy with my times in a few of them.
When you know what you are capable of, I think one then does have certain expectations. It's sometimes hard when things go wrong, but I can and do put bad experiences behind me and get on with the next one.
If I manage to fit them all in, there's one that I really might not be able to do now, then I will take Christmas week off completely from running. I'm not sure if I'm going to do the London Marathon yet or whether to concentrate on something else. I have a month or just over before I have to send my Marathon entry. Decisions! Decisions!