So the video will pretty much sum everything up, the only thing I have to add is the reasoning behind why I set everything to numpad
N7 N8 N9
N4 N5 N6
N1 N2 N3
Red = Tops N7 is your main, N4 is Slash, N1 is Mighty
Green = Pants N8 is your main, N5 is slash
Pink = Vitality, since there are no slash boots this is the perfect spot to put vitality for easy use after equipping mighty set.
Cyan = Boots N9 is your main, N3 is mighty
This system makes it easier to remember exactly where everything is since tops go down in a straight row, pants go down in a straight row, and boots go down in a straight row (with the exception of vitality)