Of course you can! There are locks and tools sold in hardware stores. But, consider calling a licensed locksmith for many benefits:
Variety to choose from. The locksmith technician can suggest you better options in your case, such as:
High security locks that are not sold in stores but sold by locksmith companies. Do Not Duplicate keys. Restricted keys. Keypads.
You can stay with your choice, but having other options are nice, too.
Professional service. The locksmith technician will fix, replace or install new locks fast and professional, making sure to adjust the locks so they lock and unlock smoothly. The installation is covered by the warranty, so, if a problem arises, just call your locksmith to get it fixed.
Additional services. The locksmith technician can check all your locks and let you know whether there is a potential problem with each one.