Prepare the area. Remove the shoe molding throughout the room with a pry bar. If you are installing around a cased doorway, undercut the casing with a handheld dovetail saw. Lay a piece of your underlayment and a scrap piece of flooring on the floor next to the casing and use it as a guide to cut out the casing at the height of the flooring.
Lay courses of flooring, moving toward the corner until you can no longer fit a full course between corner and the previous course.
Measure the distance between beginning of the next course and the corner. Be sure to account for an expansion gap.
Transfer that measurement onto the next board you are going to install, and mark out the section that will need to be notched out to fit the corner.
Cut out the marked area with a jigsaw slowly and carefully. A fine-tooth blade is recommended for most flooring.
Position the cut board in place. Slip a pry bar in between the cut board and the wall and use it to pull the board up against the previous course.
Cut additional boards to the same width as the narrow section of notched out board and install them in between the last full course and the wall. Continue installing full-width courses up against the uncut portion of the board.