co sleeping

Since I got pregnant, I've often been told to set up a separate sleeping space for the baby. At least, if a separate room isn't possible, they should have their own crib in our room. But I just can't do it. I can't sleep without my baby. She always look for my boobies when they sleep, and I always give in... I know there are many risks, but I can't do it. Please help me—where should I start to learn how to sleep separately from my baby?