I receive many questions on sight reading. The implication is that it is a special skill with tricks. The reality is that sight reading is nothing but a high level of reading. Guitar players are infamous for their lack of reading skills. Starting with sight reading is akin to wanting to go for your Doctorate before your Bachelor's degree.
Reading encompasses the following skills:
1) Note Recognition and Execution 2) Note Location 3) Fingering Solutions 4) Rhythm Recognition and Execution 5) Ability to follow the "roadmap" - a series of written instructions that moves you from one section of a piece to another and indicates something of the interpretation of the piece.
Putting these together is reading. Putting these together without preparation, just as you would read a book or magazine, that's sight reading!