Health Sciences Librarian Ellen Lutz made the following video and handout for graduate nursing students, but the tips apply to other disciplines as well. (Although Ellen is happy to meet with students from any department/program to discuss methodology, for assistance with keywords and database recommendations, it is best to contact your subject librarian.)
Here are Ellen's instructions on how to export large results sets into Excel and Citation Managers and remove duplicate items.
Most academic research articles will contain a brief literature review. However, to see examples of more comprehensive ones, here are some good places to start.
This video from North Carolina State University Libraries give an overview of the Literature Review process. (about 9 1/2 minutes)
This video from the University of Texas at San Antonio Libraries is directed at Psychology students, but gives some examples of how to organize & present the results of a literature review. (about 4 minutes)