So I thought I'd whack in a fresh thread for this as it gave me a fair bit of brain ache and now it's done I want to share

Using the fantastic PimpMySkoda page http://www.pimpmyskoda.co.uk/Amp%20Cable.htm I had an overall idea what I was doing. As a NOOB, what I really wanted was my hand held while I did it, hence this extensive photo guide for those in a similar position:

Under the bonnet I lifted the lower scuttle panel from the windscreen, by lifting it straight up at 90° from the screen. It needs a bit of force, starting from the end and working towards the middle. You can see (once it's out), that it has a long clip that sits in a groove attached to the car.

Next I removed the cabin air filter housing (that black box in the pic above), to reveal a little black grommet. Not sure if this was going to work I made a tiny hole and poked a piece of garden wire through.

With just 2 attempts I managed to get it to come out in the space behind the (previously removed), glovebox! I attached my amp power cable to the garden wire and pulled it back through the bulkhead. I had to remove the grommet and enlarge the hole, then slide it back along the cable and refit it.

From the cabin-filter space there's a convenient cable-duct, just unclip this and slide your power cable down the side. Under, over or around the airbox and you've reached the battery!

Now you just need to re-assemble which was simple enough. When re-installing the scuttle-panel I worked from the centre to the edge, pressing down on that long clip to seat it tightly against the screen again.

Back inside the car I passed the cable behind some gubbins and down the side of the car to the sill-trim.

Working back along the car i just slid a tack-lifting tool (screwdriver would do), along the sill-trim shoving the cable under as I went.

When you get to the rear seat-back you can't get under the corner to lift it. I made a loop of cable and shoved it down from the top, which made it easier to tuck it under.

Here I'd have liked to go up the rear wheel-arch behind the carpet, but I had exactly 5m of cable and this isn't enough for anything other than the most direct route.

So the cable is in and I haven't removed anything except the glovebox and scuttle-panel to get it there!

Now all I have to do is run 2 pairs of RCAs and a switch cable from the head unit to the boot. Then run 2 pairs of speaker wires back to the front to feed the speakers, they'll follow a similar route down the other side of the car or maybe down the middle. That's gonna need another cup of tea for sure

Thanks again to those that have helped, and good luck to all those giving it a go for the first time :p

On the 4th pic if you lift the fuse box to the left out there is a grommit that runs through bulkhead that comes out below the glovebox rather than running it up near scuttle panel

You need to remove more trim !

The route of the cable into the boot isn't good. You could snag the cable and get one nasty short.

The trim comes off easily, and far amount of space underneath.

There are guides to do this, but probably not findable via the search facility

You'll have to remove more anyway if you want to RCA, remote and speaker cable.

Yeah I know the power cable can't live where it is, but I wanted to show how far 5m of cable gets you. I'll have to either extend it long enough to go over the wheel arch or get it under the carpet. There's a sharp-edged lip between the under-seat space and the start of the boot area which looks like it'd easily cut that cable. I could just cut a slot into the lip, but I'd really prefer not to :no:

Yesterday I also managed to run the remote and 2 RCAs down the centre console under the carpet. Again I poked wire through and dragged it back with the cabling attached. I did have to remove the arm rest, rear half of the console and the seat bases for that, but I'm kind of enjoying getting things in with minimal disruption to the interior

Next are the speaker wires down the right hand side which are easy enough, then connecting everything to the head unit, amp and crossovers. I'm going to have a pro do the earth in the boot and make the battery connection though. When it comes to the bit that can cause damage I'm totally chicken :'(

If there's a comprehensive guide to doing these bits I'd love to read that. I'm doing this alone with internet assistance from a couple of members here, but with no previous experience so I'm on a steep learning curve here :S

Thanks for your comments guys, I'm really hoping it's worth it once it's all in