help with led button mod

[skd05]

I have led in my left and right triggers and my umd door i just got a clear face plate with buttons i would like to add buttond to my direvtional buttons and the triangel,square.o.x buttons what is the best way to put led in  The way i did my trigger and umd mod was with the pos from the speakers and the wifi swithch witch was the ground can i run my wirers from the directional button when i do that mod.Please Help