If you are planning to tattoo “for fun” or as a hobby, you should know that in most states this is illegal. The biggest, and most serious reason, is for the health and safety of your (potential) clients. Tattooing in a bacteria-ridden space, with unsterilized equipment, or even worse, non-disposable equipment, is extremely risky.
The risks associated with home tattooing start with minor Staph infections and end with septicemia (which can be fatal) and transmission of serious, life-threatening viruses. Also, using your home as a tattoo studio puts you and your family at extreme risk of infections and diseases. Simply put, this is not safe, and is most likely against the law.
Learning on your own will not allow you the ability to use modern techniques and equipment, since most retailers will not sell professional-grade equipment to amateurs. Despite what you may have read on the internet, there are NO books that will teach you everything you need to know to be a tattoo artist. These will only give you bits of information, and without good, working equipment and true, complete information, you just can’t tattoo all that well.