There are several serious problems with choosing a high-paying, low barrier to entry, blue collar job if you are a young man with a middle-class upbringing.
1) High possibility of physical injury. Very often you will be used like a disposable machine. Even on jobs which don't require a lot of heavy lifting or similar, you may be required to do things like drive a semi-truck for 36 hours with no sleep.
2) High level of association with co-workers who smoke cigarettes, drink, have criminal habits, etc.
3) Lack of cultural knowledge and social connections that might make the job easier for you or grant you access to better positions within the field.
4) High degree of intermittence of employment opportunities also possible. Although, I would say that currently this is a declining issue due to technology making "at will" employment contracts more of a 2-Way street. For example, if one worker at a loading dock sees on an app or gets a message from a friend that some other loading dock is paying $2 more/hr., he will tell co-workers and they will all be able to almost immediately able to switch from one gig to another. This is even true with less likely demographic and more high skilled gig work. For example, almost all of the Boomer-age female retired teachers who worked for the same private tutoring firm with me quit when they learned how large of a cut (50% !) the firm was taking. Interesting note would be that the trend is the opposite for many full-time-with-benefits-white-collar-jobs. For example, data analysts may have to complete up to 8 different levels of interviews just to get one job.
Anyways, good on you for making call on "Efficiency" program. You are a quick study! However, one other useful takeaway from it would be:
Learn Sales for Every Interaction: ...the skills you learn by selling will give you the toolbox necessary to live a comfortable life...if you can sell, you can transfer that skill into the most important aspects of your life: earning money, dating, making friends, and interviewing...In short, sales is the most transferable skill you will ever learn.
Interesting note would be that Robin Greenfield, who is currently living about as opposite to Wall Street Playboy lifestyle as could be imagined, also describes starting out and being able to earn significant money through sales while he was in college. I'm going to posit that learning/mastering the skill of sales, having the experience of starting/running your own small business, and/or learning how to invest towards FIRE can basically serve as the same purpose or path stone in Modern life/development.
https://www.youtube.com/watch?v=UVY51wb5OBw
If you consider the classic mythical Supply/Demand curve of Econ 101, or even the dichotomy of Production/Consumption, Sales/Marketing and Finance are towards the model maker/breakers. For example, my rags (was unemployed and eating from dumpster at age 26) to mega-riches (died with net worth greater than 100 million at age 80) friend, entirely made his fortune through financial products, starting out by selling them. And this was already the most efficient way to proceed back when he started out in the 1960s. Unfortunately, like a famous character from Dickens, he stuck too narrowly and long with this piece of advice from "Efficiency":
Obligations Are Now Gone: If you are starting at ground zero, you have absolutely no obligations to anyone. This includes you friends, your teachers, and even your family if they are not going to help you to succeed. Everyone encourages you to join the Peace Corps or worry about "the children" and other social matters that are now irrelevant to you. We will reiterate. All obligations for you to do anything are now gone.
It is important to note, this does not mean you will live a life without consequence, it means that you will no longer have an excuse of "obligation to someone else."
The very good thing about the highly flexible and generalized ERE program is that one could theoretically simultaneously lower ones own expenses DOWN to global sustainable level= 1 Jacob, save/invest enough money to retire very young, and also lift a child in Africa UP to 1 Jacob spending. IOW, you could even start being a Human of Consequence on Day 1! If you watch some more Robin Greenfield videos, you will also learn that it's much easier to gain access to radiantly beautiful strong females by becoming a Human of Consequence than by learning from the Wall Street Playboys and/or other successful Pimp/Players how to offer insecure females well-crafted insults in situations in which they are more likely to be inebriated. It is even easier than offering a 50/50 power couple contract to a similarly successful modern female who only expects you to cover half the expense of yearly international travel and private schools for your 1 kid or life-extension vet bills for your 1 dog.