non dire gatto se non ce l'hai nel sacco angolul

don't count your chickens before they're hatched▼(one should not depend upon a favorable outcome to one's plans until it is certain to occur)
phrase
[UK: dəʊnt kaʊnt jɔː(r) ˈtʃɪkɪnz bɪ.ˈfɔː(r) ˈðeə(r) hætʃt] [US: ˈdoʊnt ˈkaʊnt ˈjɔːr ˈtʃɪkənz bɪ.ˈfɔːr ˈðer ˈhætʃt]