Rewiring

[shavedchevy]

I've got so many wires running under my dash.. shaved door handles, interior lights, stereo wires, alarm wires, wires I don't know were thhey go but still have power in them, wires pulled down so I could splice onto them.
I'm not complaining, since this is mostly my doings, but I would like to know if rewiring is a full pledged job, or could I do it on the weekend. I'm fairly good with electrical.
My main reason for doing this is that I feel with all this auxillary stuff running of my constat power for my head lights or stuff like, that I'm losing power. So I would like to keep things neat and tidy and use the fuse box.
Any sugggestions, or should I just go for it.