QuoteSuccess is having everything you need and doing everything you want. It is not doing everything you need to have everything you want.
This is the crux of all the gobbledygook in the two pasted posts. Choose your values, your pleasures, and set goals to achieve them. If you are living pleasureably, it's possible that you won't feel the need to retire early. Or at all! If early retirement is a pressing desire for you, by all means go for it, but prudently.
A key piece of Epicurean philosophy as I see it is to examine and understand our desires and pursue our pleasures. To me, this is a much more effective and satisfying approach than ERE as described. It still takes study and effort, but in return you get to better understand yourself and the world. Self-sufficiency is encouraged but, just like pleasure, that means different things to different people. ERE just sounds like verbose minimalism. Isn't that somewhat contradictory?