I didn't really expect to learn anything from getting tattooed, or for tattoos to change me in any way. I got my first one due to an interest in the art form and out of curiosity/a desire to take a risk and experience something new. The whole process of getting tattooed (everything from planning the design to scheduling the appointment to waiting for the appointment to trusting the artist to not F*** up your skin to living with the work after it's done) has been so much more fascinating and fulfilling than I could have ever imagined.
I think getting tattooed is a pretty intense trust exercise. You approach an artist - who's probably a stranger, describe what you have in mind, and trust that they'll be able to execute your vision and put it in the right spot and apply it with proper technique. Even after you approve the sketch, you have to trust that it will transfer well to skin, and that the color palette will match (or be better than) what you imagined. All that can be nerve-wracking, but as someone who loves to control everything she can and worries incessantly about plenty of things she can't, there's something incredibly therapeutic about relinquishing control and putting trust in a stranger to put something beautiful and permanent on your body.
My tattoos have also been a great exercise in acceptance. My control-freak nature also comes with a healthy dose of perfectionism (and a propensity for not taking risks), but with my tattoos I've had to let that go. I think I have great tattoos, but of course they have their flaws, and learning to live with and accept them has been healthy for me, I think. I made a choice to get tattooed, trusted my artists, and have to accept the work as it is because it's there forever whether it turned out like I planned it or not.
Lastly, I never expected getting tattooed to be so FUN. Not that I explicitly enjoy the needles-boring-into-my-skin part, but the excitement and ritual leading up to tattoo day, hanging out in shops, seeing the huge lovely flash collections on the walls, and meeting interesting people has been so delightful.