Eleanor's Temper?!

Brett and I just found out this week that apparently Eleanor has discovered her temper! What has happened to our calm, laid-back baby??! All the sudden this past week, she has had MAJOR temper tantrums on a regular basis AND has started to use the word "NO!" regularly, too! She has been repeating words pretty regularly since she has been about 15 months old and has a pretty large vocabulary, but for some reason, she never used the word "NO" until this week when she paired it with the tantrums. FANTASTIC! At least we figured out that most of the tantrums are related to wanting to do something all by herself (taking crackers out of the box, putting the top on the cup, taking the peel off the banana or trying to put on/take off her shoes). Isn't that supposed to happen closer to two? Eleanor definitely picks up a lot from The Original Little Miss Independent- oh, I mean Caroline! : ) Or maybe it's just a girl thing? Help!