Plan it out first.
Decide where you are going to mount the amp(s). Decide how much, and what gauge power cable you will need. Decide how long your RCA cables will need to be. You should take into account that the cable will be running from the center of the car, out to the side, and around several bends and curves. When deciding how much power cable, think about how you will run the cables first!

You don't want to get 18 feet of cable, and then realize you can't go down the middle of the car, you have to go down the side, and it needed to be 2 feet longer! It is often easier to just take out the seats, kick panels, and sill plates before starting. It just makes it easier to work, and often you need to do all that anyway. Removing the front seats is optional, but it gives you more room, easier to lift the carpet, and it is often best to run the wires there.

As you remove the seats, take note of where they run close to the floorpan. It's easy to accidentally crush your wiring when bolting the seat down, and that is very frustrating. Once you set your mind to it, it's really not that hard. A cordless drill and a socket set make it a breeze. I have taken apart many an interior in 10 minutes, and can assemble it again in about 15, if I am in a hurry.

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