We are euro-newbies but will try to culture up a bit by touring Dublin, Amsterdam, Paris, and Rome in 12 days. I don't expect it to be easy and will be diligent on researching for the next few weeks to try and not stick out or become dependent on local help.
Don't ruin your trip by attempting those four cities in less than two weeks. As others have stated, cut it to two and enjoy your visits.... Rookie mistake is trying to get too much into a short period of time.