Ditto SK.
The more you read the greater your confidence and the greater your sense of purpose.
If you plan the sections of your Lit Review before reading (i.e. a list of headings and subheadings), it will focus your mind on what is and isn't relevant when you're ploughing through the literature so should keep you focussed.
If you set up EndNote as well at this time, you can begin writing and citing as you read each article. That way, you won't have to re-read them later. The LR can be a bit daunting, so the trick (as my supervisor frequently reminds me) is to do a only a few hours at a time (e.g. every morning), then do something else in the afternoon so you don't get information overload. Good luck!