I am, for my sins, an actual grown-up with an actual grown-up job. I mostly wear long sleeves at work, but in contexts where no-one'll be bothered, I do roll them up. I'd say, expect to have to keep your tattoos covered at work, and if you don't feel you can bear to wear long sleeves every day then maybe think about a different location for your tattoo. (You should see the bother I have to go through safety pinning my work blouses to make sure the tattoos on my chest don't show!)