Request for Amplifier Install guide w/ Pics

I know there have been numerous posts on aftermarket stereo installs and upgrades but could someone post a generic install guide w/ pics on their amplifier install primarily focusing on 'power turn-on' cables, where they grounded the amp, wiring to the battery? Also if many of us are planning to use the factory head unit, where to splice speaker wires for inputs since we're not using RCA cables. Much appreciated!!