I was going to avoid answering this post, but knowing the kind of replies you are likely to get, changed my mind.
How well you do in this industry will be determined, to a great extent, by the character and personality of the individual.
There are people in service industries who are incredibly knowledgable, or grafters, or well resourced, but can't run a business and often fail.
I always suggest that anyone considering this business, should start by purchasing an inexpensive machine, to learn the basics and find out, if you are suited to the work involved.
If you approach suppliers, they will all offer a basic ' hands on ' training when you purchase a machine, many offer training separately and the charges are very reasonable.
good luck