1. to be overconfident
do not get ahead of yourself
To 'get ahead of yourself' means to prematurely plan or to do something too early on or before you are properly prepared. If you are getting ahead of yourself you might be focusing on events in the future before dealing with things in the present. "She's really getting ahead of herself she has all the furniture bought for the new house but the mortgage hasn't even been approved yet." " We can spend a lot of time arguing about how to market the product but I think we are getting ahead of ourselves. Let's get the design right first."