I'll admit it.
I'm not the best speller in the world.
In fact, I'm not even as good as I used to be, because spell check has made me lazy and I know, if need be, I can correct myself. However, if I'm writing something by hand, I check words I'm not sure of before I proceed. I'm not stupid, I'm just a poor speller.
So, if I were a tattoo artist, I'd keep a Webster's handy. You know, just in case.