Stamps of consular legalization can be affixed both on the original documents and on the notarized copies. In practice, copies of the documents are often legalized, since the process of legalizing the original can take one or more months.
Kindly prepare the notarized copies of documents with translation. The translation language depends on the requirements of the state authorities in Kuwait where the documents will be submitted. Make sure you have learnt about these requirements in advance.