Reading the advice in the handbook, I don't think it's all that different from what you'd need to start a lifestyle business. You still need to start with a business niche that is underserved where you can make a few customers very happy. You still need to focus on improving your product (or service) to the point where people will give you business via referrals - pounding the pavement for every single sale isn't a very desirable lifestyle. You still need to listen carefully to everything your users say, and to focus tightly and improve the product.
The difference, I think, is that a lifestyle business is a startup where you take your foot off the gas once your income meets your personal needs. It doesn't need to be a monopoly - in fact, it's better if it isn't, because if it is some other company will likely monopolize it. And you don't need to deal with the fundraising and hiring parts of the handbook, since you never get that big. Everything else seems to apply, though.