Is there a 2-year-old in the house?

It's only been 7 months since Kellen turned 3, but somehow I had forgotten about 2-year-olds. Some people say the 2's are easy, but the 3's are hard. That has not been our experience with our children. We are hearing lots of "Nooooo!"s and "I don't want toooooo!"s. The good thing is, as a now-experienced (snicker, snicker) mom I don't find that I take the rough patches personally and I certainly don't get as upset or frustrated after a whole day of toddler complaining and stubbornness. The bad news is that I think we definitely do let her get away with more, probably because she is more easy-going and less strong-willed than Kellen. And also, she's a girl. Not that this is a good reason at all. I'm also trying to be sensitive to the fact that I think she's taking all the changes more personally than Kellen. He's interested, not scared. She's wary.