No offence, but doing a tattoo yourself without the experience of working and learning at a proper tattoo shop is extremely idiotic and dangerous. And i fail to understand how simply reading "instructions" gives you the knowledge on how to tattoo someone. I'm not sure what the law is where you live on how old you have to be to get a tattoo, but most places seem to be 18. At 16, i don't know where you would get a real tattoo machine, or a better question, who would sell one to a 16 year old. If your friends agree to you tattooing them, they're even more idiotic.