Stapes i've just had a custom peice finished and my tattooist was pissing himself with excitement at the thought that he could get to be creative and sketch up a design using his creativity with my idea (im FAR from an artist and he's Latvian so it took me a while to get it accross lol)
Present your ideas to various places and see who shows a buzz towards doing the idea, if they aren't keen they aren't worth the time!
Prepare to wait (any good artist has a waiting list!) and prepare to pay through the nose as a large peice (eg. a sleeve) will set you back £60ish an hour for around 10 (half sleeve) to 20 (full) ish hours!
Good luck buddy