In that case, if you go for something by Harvey, try the article first. The book is good and relevant but it's more of a Marxist approach to geography. Or a way of explaining Marxism through geography. Depending on your perspective. The Crawford book, especially, will get you pumped for switching to trade school. Or rebuilding a vehicle.

Remember as well that there's a route back to the office if you go to trade school now. Some big companies will even pay you to take a degree later if you have the talent and motivation for it (which you do if you got into uni in the first place, even if you've gone through a rough patch with some current modules). It may depend on your location, though.

Hope all this helps.