Measure twice, cut but once.
More Hungarian Proverbs:
A flatterer is a secret enemy.Hungarian
Better to return from half-way than to take a wrong road.
Hungarian
Nobody is forced to attend the dinner given after killing a pig.
Hungarian
Do more things by wisdom than by force.
Hungarian
A scalded dog fears even the rain.
Hungarian
Gnawing on bones is for dogs having teeth.
Hungarian