These tricks are very similar so they are grouped together. Both tricks can only be done as Adult Link since they both require the Hover Boots.
As Adult Link, equip the Kokiri Boots, get next to a ledge and place a Bomb behind you. When the Bomb blows up it should push you off the ledge. On the first frame where Link starts to jump off the ledge, pause and equip the Hover Boots. If timed correctly, you should then do a Megajump.
Unlike the Megajump, you only need a source of recoil for this trick. While you don't necessarily need a damage recoil, it is the most prefered way.
Method 1: Damage (preferably a bomb). When you get hit, Pause Buffer to the 2nd frame of visible damage, then equip Hover Boots. Unpause and you should be going at a high speed with the Hover Boots, allowing you to cross large gaps.
Method 2: Megaton Hammer Recoil. On the frame where Link is pulling out his Hammer, back up after hitting the wall (seen to the right) pause and equip the Hover Boots. You will travel faster than with the the damage recoil method, but it is restricted to areas that are relatively close to a wall.
Method 3: Crouch Stab Recoil. This method is similar to the Hammer Recoil method, except the Hammer is replaced with a crouch stab. On the first frame Link has visibly moved backwards, Pause and equip the Hover Boots to gain speed. This is the slowest out of the 3 methods but because it requires nothing more than a Shield and a Sword, it is sometimes the only option.