Is there an existing wire? If so, you can tie off the new wire to the old (or 2 or 3) and pull the old wire out, pulling the new wire in. If this is possible, the trick is to keep the tie off point as small in diameter as possible and as smooth as possible so it doesn't get hung up.
Other than that, fish tape, is your friend, but you won't have much fun with it. Again, keep the end as small and smooth as possible.
Wannabe...