I had the same issue with one of my tattoos as well. What I did was go to the artist who will be doing it, and get him/her to sketch it up for you. Doesn't (usually) cost extra to have them do it. That way you can see what it will look like and/or have it tweeked to your liking.
Mine turned out great and it also let him be creative as well.
Check out www.strikethebox.com for a bunch of firefighter tattoos to give you ideas and a reference for the artist you pick. They have hundreds of pics of firefighting tattoos and there are some really amazing ones there.
thanks guys :) i found one its bit manly haha my step mum does all my tats so hopefully we can tweak it