Advice for a future teacher?

I'm a 19 year old male, and will hopefully be going to college within the next year for a degree in history to become a teacher. I love forearm tattoos, and have wanted one since I was around 16 years old. Of course, I also realize that having visible tattoos, especially since it will be slightly tribal in design, might not be the best course of action if I want to become a teacher. Some of my teachers from high school had visible tattoos, though most were ankle tattoos or at the base of the neck. I know forearm tattoos can easily be concealed by sleeves, but would it even be wise to get one? Is there anybody here who has experience with this? I know that most wouldn't care about bicep tattoos, so if all else fails I can get one of those, but I really want one on my forearm. Any advice?