Installing component speakers

Hi all, apologies if this has been asked previously, has anyone got a good guide for fitting a new set of components (including crossovers) into the Clio? This will be my first effort so the more detailed the better. I'm struggling with working out how/where to route the wires, and whether or not to use the existing wiring in particular. Any and all help greatly appreciated, thanks.
 
Thanks for that but I've actually already bought some that I managed to find cheap in a local shop, bit of a whimsical purchase really, unfortunately there're not the straightforward plug and play ones, so back to the drawing board I think, thanks though. Anyone else?
 
Did you manage to get some installed? I bought some Component speakers without really thinking or knowing what I was doing.

Should have stuck with coax.