Don’t sell the bear’s skin before you’ve caught it.
used to mean that:Don't celebrate too early, before you know the actual outcome; Do not act on as the owner of something until you actually have it.
alsoDon't spend your money before you have it.
Don't count your chickens before they are hatched.
Do not halloo till you are out of the wood.
The opera is not over till the fat lady sings.
; it’s not over till it’s over.