If you want to quit your job and make money blogging you have to keep in mind that you have to study and practice a lot.
Starting a blog from scratch is just as difficult as starting any business. It requires the same time and effort as starting your own shop.
Yes, having a store is different, but the first few years are usually the same story: low income, lots of stress, big learning curve.
Sounds horrifying? To be able to work from anywhere in the world, take a vacation whenever you want? Sounds like a pretty good deal to me.