you definitly dont need the early master sword to do this glitch, you can do it as soon as you you get the slingshot, although there is a way to get it before you get the slingshot but that way is much much harder.
anyway if you do the first part of the trick you may be able to keep the WS for most of the game which is good, you can also just leave the WS in its chest after the first part of the trick. saving it for your final battle maybe.
the second part of the trick took me an hour, maybe 2 and i had to do it for 2 files because the first file was an early master sword file that had the dead end at the goron mines (see: early master sword dead end and early master sword fixed on youtube for details) anyway save at that point in the game and be prepared to get frustrated, it takes dedication to do some glitches in Zelda but the pay off is worth it. Study the video, and also the only tip i can give you is to jump back when the enemy raises his club attack and then hit A when he reaches the highest point, making sure that you are angled ever so slightly away from the wall but still almost parallel.
Dont try to keep jumping right against the side of the way when you attack, it almost never works that way.