get ahead of yourself idiom
操之过急，（在没有准备的情况下）过早做…
to do something too early, or before you are ready or prepared
That last game suggests that we have been getting ahead of ourselves in praising the team's progress. 最后一场比赛表明，我们赞扬球队进步的话说得太早了。
She didn't want to get ahead of herself and risk losing what she had achieved so far. 她不想操之过急，以免失去目前所取得的成绩。