I have worked a data entry operator for ship billing companies, which I had to work through 40-70 document for 8 hours of working. In order to ensure accuracy, I think carefulness from one person is not sufficient, but the double-check from second person will minimize mistakes.
According to your description, I still can't fully understanding what i should do to satisfy your requirement. But let me talk about my previous experience on data entry job of screening through immigrant documents to fill in data system of hand-writing name. In order to complete that task with limited mistakes, I have to used google at the same time to ensure the name is existing.
Hope to see your replies,