I don't have to think up each incident in sequence, I can just decide on the big one and jam in the extras once that's sorted out

This is how I do it, too! Or at least, try to do it. I've got an idea of the theory, but the practice still eludes me. :)

I couldn't believe how expensive the book was! Hopefully the copy you found was reasonable. It's 400-and-some pages and pretty densely packed with advice, so at least you get a lot for your money. I hope you find it helpful!