The last of the Mohicans noun phrase
The last remaining member of a group, kind, or race
I am the last of the Mohicans. Everyone who came with me is already gone.
Poor that little boy. There's a lot on his plate right now. After all, he is the last of the Mohicans.
This phrase came from James Fenimore Cooper's 1826 novel The Last of the Mohicans.
To do something in the wrong order
Don't put the cart before the horse by saying something without consideration.