Place a bomb either in front of, or behind yourself and face a ledge that is normally too high to reach. Pull out your sword and jumpslash when the bomb's flashing speed, as well as its radius, increases.
This method is slightly more difficult than method 1, but can be a lot more useful. Get near a ledge and pull out a bomb. As it's flashing speed begins to increase, jump off of the ledge and at the height of your jump pull out the deku leaf. If done correctly, you should glide for a few seconds before gaining a boost off of the bomb's explosion and reaching your destined ledge. This can be done, to reach some ledges, without the aid of the deku leaf.