No tools needed, you can do it all by hand.
First off, open the tailgate a little, then undo the cable eyelets from the bed. Each side slides through the round bolt that they hang on. Then lift up on the right side of the tailgate. The part that pivots on the bottom should pop up and free itself from the bed. After that, pull the other end towards you. The left side should slide off its pivot and you are done.