put the cart before the horse

US /pʊt ðə kɑrt bɪˈfɔr ðə hɔrs/
UK /pʊt ðə kɑrt bɪˈfɔr ðə hɔrs/
"put the cart before the horse" picture
1.

to do things in the wrong order

:
You're putting the cart before the horse by buying furniture before you've even found an apartment.
Let's not put the cart before the horse; we need to plan the budget first.