Im going to change the pick ups in my tanglewood les paul. I want to drop in some active EMGs. At the moment its got 'Entwistle' stocks. How hard is it to do the wiring myself. Ive heard that all of the volume and tone pots need changing. is this true? also, where is the best place for the battery. Ive never soldered before so i'm gonna be usless. anyhelp?