Hi K.,
There are very different ways of doing it and not everyone agrees with the CIO method. With our daughter (now 14 mo) we tried laying her down and cry forever method. 'I' couldn't do it. It tore me apart. We then went to the Ferber Method. Lie her down drowsy. Let her cry 3 minutes, go in (do not pick her) rub her back calm her down, leave, let her cry 5 minutes go in do the same, leave, let her cry 8 minutes go in do the same, etc. She never go past 10 minutes of crying. Do the same for naps. Now we put her down sleepy and leave with no problems. It's wonderful. Although the past two nights she wakes up (think it's teeth). The Ferber way helped me because I was able to go in and comfort and she new we weren't leaving her in there all alone. I think it took about 3 nights to get her in the routine.
Another Ferber note: keep her up a few minutes 'after' her scheduled bedtime. She will be too tired to cry.
Good luck....have a glass of wine during the crying :o) It helped me.