how do you install a 4 channel amp...i would like to do it myself..shop charges alot of money..is it easy?...i will have amp mounted on the front of my box cause my sub amp is on other side no room...i know you run RCA from HU to amp...what about remote? you just run it from sub amp straight to 4ch amp?...and power and ground...do i have to run another line from battery or can i use a distributation block for both power and ground..what about fuses will i be okay with that?..and speaker wires..where do i connect them to..from amp channels to the speakers itself or the HU??..please help