You will need: A chair, some material, a staple gun, a screw driver, some scissors, and some pliers - just in case you need to rectify any mistakes.
Once you've stapled all four sides, it's time to work on the corners. Pull the excess material together and, if you want to, staple down each side until you're left with a thin flap in the middle. You can get away without stapling down each side but it's a bit trickier if you're doing it alone. Pull the flap of excess material as tight as you can and staple down each side, and along the middle.