My daughter is one and recently started to go to bed alone, she cries, but we find that letting her cry for a set period of time to start, say 5 minutes, then go in, pick her up, tell her its bedtime in a soft voice, then replace her, leave her another five minutes, repeat the procedure and so on, as you repeat this procedure, leave her for a bit longer say 10 minutes, eventually she will go off to sleep. It takes some time and patience, but believe me its worth it! Also if you can find a teddy to tuck under her arm so she feels some sort of security when she goes off. My daughter now cries for a couple of minutes but she has her teddy and goes off eventually! Promise it will work, good luck!