Wanderer, I got my ears pierced 24 years ago, my navel pierced 13 years ago, and a tattoo on my calf a year ago. I still like them all and am glad I did it. What makes you think a person can't make a decision about personal ornamentation and remain happy with it?
Good for you Crumpet! Make sure the design is one you love, that you don't "settle," and most of all, if the tattoo artist designs something that looks different from what you have in your mind, make sure you absolutely love it MORE than your original idea before you let him ink it.