Co-Sleeping

So I was always one to say I wouldn't co-sleep just to be on the safe side...but here I am with a 12 day old baby and have been co-sleeping. Just in the early morning hours because she won't sleep then unless she's in my arms. 
Any advice to help her sleep on her own or any personal experiences with co-sleeping?? I love having her in my arms but I always have that "what if" worry in the back of my mind.