How this one is meant to be worked through, in the author's own words:

1. Read Chapters 5 to 8 first, in order - they are the four rules and every later chapter refers back to them. Then read Chapter 7 AGAIN, on its own, before going under a vehicle on somebody else's ground. Then Chapters 21 and 22 before the first paying job.
2. Chapter 7 is different from the rest of the book. Everything else is about money, reputation and inconvenience; that chapter is about the fact that vehicles fall on people, that it happens to competent and experienced people on a day slightly different from the other nine hundred and ninety-nine, and that in mobile work there is nobody there to find you.
3. Before taking another booking, spend ninety minutes lifting your own vehicle on your own drive - on concrete, on gravel or grass, and on block paving, with and without load-spreading boards. Watch what happens to a stand foot. Push-test the corner after lowering. Put a bar on a fastener and see how much the whole vehicle moves. It is free, and it is the only part of the trade where being wrong is not recoverable. Chapter 36's scenario.
4. The commitment threshold is the point after which the vehicle cannot be driven away and before which it can. It exists in almost every job, almost nobody can name it for the job they did yesterday, and it does not feel like a decision - because the decision seems to have happened on the phone three days earlier. But the phone call was made with far less information than you have standing at the car, which makes that minute the best-informed decision point in the whole job and the one everybody skips. Chapter 5.
5. Nothing that makes a vehicle undrivable comes off until two sentences have been said OUT LOUD, preferably with the customer listening: 'If I stop right now, is this car drivable?' and 'Am I certain I can finish this today, with what is in the van?' Any answer of 'probably' is an answer of no. Chapter 5.9.
6. Four stop-work items, answered before any customer vehicle is touched: you are not insured for what you are about to do; you do not know where your waste is going; the ground or support arrangement is not sound; and you are about to say a vehicle is safe or roadworthy. Chapter 14.11.
7. A jack lifts and a stand supports. You do not go under a vehicle supported by a jack - not briefly, not to look, not on concrete, not ever. And you do not use improvised support of any kind. These are absolute rather than weighted, because every incident of this kind was preceded by somebody making a reasonable-sounding exception once, for a good reason, on a day they were slightly rushed. Chapter 7.9.
8. You cannot see what is under a driveway - drains, soakaways, service ducts, poorly compacted fill, voids, and the dangerous combination of a hard surface over a soft sub-base. A vehicle on four tyres spreads its weight; a stand concentrates a large share of it into a few square inches, which is a question that surface has never been asked before. So load-spreading boards go under everything, on every surface including concrete, and are not conditional on the assessment being pessimistic. Chapter 7.2.

Written to be used rather than skimmed. Every financial figure is left blank on purpose, and anything touching law, tax, insurance or data protection is written as questions for a qualified professional rather than answers.

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