Summarize the following:
Using a circular saw, make single cuts straight across the flooring that are about 1 foot (30 cm) to 2 feet (61 cm) apart. Be sure your cuts are perpendicular to the direction of the wood. Start on 1 side of the room and work your way systematically to the other side, spacing each cut about 1 foot (30 cm) to 2 feet (61 cm) apart.  Always keep your hands away from the blade of a circular saw. Wear goggles over your eyes when operating the saw to protect them from debris. Wedge the pry bar into 1 of the cuts. Tap the end of it with a rubber mallet to drive the bar more deeply into the cut. Use the bar to pry the first piece of hardwood out of the floor. Be forceful if necessary.  It doesn't matter where you start in the room. Start a discard pile for the removed planks.

Summary:
Make cuts perpendicular to the direction the wood is laying. Pry up the the first hardwood plank using a pry bar and mallet.