Depending how crazy you want to get with the install it can be as easy as:
- running a wire wrapped around a fuse (might not be as easy if you have glass fuses).
- tap into the Ign + bundle (white wire), and ground bundle (black).
- speakers are easy to wire, hard to mount.
- You can go all out and run wires from the battery with in line fuses also.
As long as you have a fuse in there I think you will be fine. Consider a marine radio!
Lemmings as you know them are a Disney fabricated lie. The truth is out there.