Piercings are easily removed, tattoos not so much. Speaking as someone who has both in highly visible places here are a few things to ponder:
1) why are you doing it?To look a certain way, to say something about who you are, to commemorate someone or thing
2) will it impact my employment?
3)will you regret it? Try a fake tattoo and/or piercing for a few weeks to see how you feel about it
4) have you researched the professional doing it well enough?
Finally, my final piece of advice is to not over think it. There are tons of good reasons for and against, but life is too short to not look the way that you want to so if it's something you feel strongly about then go for it!