Prepare your room by removing wall trim or baseboards, leveling your subfloor and installing the underlayment over the subfloor. Cut the casing of the door just enough to clear the laminate.
Measure the width of the room and divide it by the width of the planks to ensure that the last row will be at least 2 inches wide. If it won't be, you'll need to rip the boards in the first row to make sure the boards in the last row are at least 2 inches wide.
Remove the tongue of the boards in the first row.
Place a spacer between the first board and the starting wall.
Add the second board, connecting to the short side of the first board. Follow down the wall until the first row is complete. Cut the last board to fit.
Cut the first plank of the second row according to the instructions. Different manufacturers recommend a different stagger length for the rows; however, you may have a piece suitable for the recommended staggering length left over from the first row.
Attach the first board of the second row and work your way down.
Mark the board that will be on the corner of the "L" when you get to it and cut accordingly. More than likely, the boards will not line up perfectly so you won't need to cut a notch out of the board to fit around the corner.
Cut the other boards for the "corner" wall to be the same width as the first "corner" board (the board that fits around the corner).
Complete the room by installing the planks as you have in the rest of the room.