fall over (oneself)

To expend an inordinate amount of energy or effort to do something, especially as a means of gaining attention or approval. John is such a teacher's pet, falling over himself to impress Mrs. Smith. My parents fell over themselves trying to seem cool to my friends. It was pretty embarrassing, to be honest. I can't believe how ungrateful you're being, especially since we fell over ourselves planning this dinner party for you!

fall over yourself

be excessively eager (to do something).