They will put some people off, we all judge a book by it's cover to a certain extent, it's part of our self protection mechanism.
When I started out 20 odd years ago I was Punked up to the max, tattoo's pretty much everywhere including my face (since had them lasered off), looking back now WTF was I thinking, what it did teach me though was that I had a window of about 5 minutes to get a conversation/rappor going with the customer to show them that I was no different than them and actually quite a nice bloke (if I do say so myself)
Be yourself is my advice, and as long as your not an not a very nice person you'll do well
