General computer data base searches don't always identify peer-reviewed journals. It takes longer than you think. It takes time to sort through abstracts to determine which papers will be most relevant. Be prepared to order articles through interlibrary loan. It is worth taking notes.
People tend to read more closely when they take notes than when they use a highlighter.
Write down the complete reference, methods, important findings, statistics used, major strengths and weaknesses, implications for future research and any of your thoughts. Reading the abstract is not enough. There is a difference between out-of date and classic sources. There is no requirement that all your references be from the last four or five years.