Does anyone know of a good guide online that goes step by step preferably with pictures of how to install a complete system?

I have a neigbour that wants to install his amp, but neither of us know how lol. We don't know about crossovers etc. So I am wondering if someone knows of a good guide to install amps, crossovers etc. I'd like to know myself, so I can install my next system, rather than pay and arm and a leg like I did last time having someone else do it.

 

heres a link to a DIY guide to installing an amp.. it doesn't have any pictures but its pretty straight forward..

AMP DIY

hope this helps