Sleep training

What are your thoughts about sleep training a 2 month old? I try one nap a day in his crib. He has a hard time falling asleep and is generally very overtired :( He can tolerate laying in the crib or wherever I may have him trying to nap at the time, but will cry after a little time. Is cry it out too early to practice? I am trying to get him ready for when I go back to work and he is at his in home care location. She will not be carrying him the entire time he is napping and I want to get him ready for being able to sleep in his crib at this time. Is 2 months too young ? Any suggestions to make it easier on both him and I? Any ideas of alternative ways to get my infant to sleep during the day when he is over tired? Thanks!!!!!!