Open the hood and remove the 4 bolts holding it in place. Simply attach the new one and bolt it back down as the first one came off. Check your parts yard for the best deal on these!
First remove the hood itself. Identify the latch by noticing the serial number particular to your car's model and buy it at an auto shop. Install and attach the hood.
According to me if you want to replace a buick century hood latch, you have to concern a veryy good mechanic for that who knows every thing about it, and he should be an expert.