why are naps so hard???

I am starting to think that every 2 months I need to have a professional sleep consultant come over for a week. Every time Sophia adjusts her napping I get completely confused and thrown by it! I think we are back to one nap, but she tends to wake in the middle, and I can never be sure if she's done or not and since the crying just breaks my heart I end up going to her (today I was convinced that she woke up because she was hungry since it was noonish). I KNOW that I need to be firm and let her cry it out if she's not actually ready (happy) to be awake, but I second guess myself and doubt and ultimately I wonder if I am causing her to learn to wake up after only an hour????!?!??!?!
I was able to let her cry it out in the middle of the night, I was able to let her cry it out at bedtime, but for naps I am all alone and I just breakdown. I feel so pathetic.