It's hell! We have a 4 year old who seems to be our emperor. We have to do whatever she says or feel her wrath. And she won;t tire of crying and whining until we give in. And mostly we do! There are time I catch myself arguing with her and then I stop and say 'what the hell am I doing?'
So definitely see your point.
I think our two daughters may have some quantum connection - they sound so similar!
good luck!