get ahead of (oneself)
To plan or become overly excited for a possible future event. A: "I love this house, I can't wait to live here!" B: "Whoa, the sellers still have to accept your offer, so don't get ahead of yourself." I think she's getting ahead of herself here—I mean, they've only been dating a few weeks, and she's practically planning their wedding. I know you'd love to go to this school, but don't get ahead of yourself—you still have to take the SATs, for one thing.
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