The way to solve that particular trick is to stand in one spot and use your shield to reflect the deku seeds relased from those monsters by just moving your view point, that way, it saves the time of having to move around a lot. Again, practice more and you will find it pretty easy as it is one of the ealiest trick that requires a little bit of action, it can not be very difficult.
Even if he can find the website, I don't think he will understand the guide or he may just don't have the patience to look into each English word, it's too hard for him. I suggest that he needs to work it out by himself.