Being able to pace yourself comes from experience. You can feel how fast you are running such that you know what a 8/7/6/5 min mile feels like. It's quite remarkable that you can sort of program yourself to run say a 7 min mile and then actually complete the said mile within a couple of seconds of the 7 mins.
I've also got them both and must say that if you ever start to feel demotivated, just picking up one and reading a chapter or two will have you heading out of the door for a run even in the coldest/wettest weather.
Ron Hill is a truly amazing guy. I grew up with Seb Coe and Steve Ovett as my heroes but after reading the Ron Hill autobiography I am now even more full of admiration for him.
Just looked on Amazon and indeed they are almost £50 per volume. A big shame because they are a must read for any runner.