**UPDATE**
took me all of 20 mins to put in. I took pics for those who want to know exactly were it all is.
Also, i realised i only need one lens. i ordered two. if anyone wants the other one PM me.
Passenger side
Take out those three screws and pull out the plastic tabs they screw into.
Pull the felt cover down and chuck it out of your way.
the bulb holder is on the far left hand side under the dash. It's grey in colour and is wrapped in grey foam. Pull the foam off it and plug the bulb in.
*note* if you use LED bulbs, they are polarity sensitive. In non geek-speak it means they have a possitive and negative side. Test them, and if they don't work, unplug them and turn them around.
I haven't received the lenses yet so i'll just guess the next bit.
Now, go and retrieve the felt cover from wherever you threw it earlier and look at the back side of it, you'll notice a rectangle in it. Push that rectangle out, you wont even need a knife!
Pull the bulb holder through the hole and attatch it to the lens holder then push the whole thing back into the hole.
reinstall the felt cover and you're done!.
Drivers side
This requires a little more work.
undo those five screws and pull the kick panel out.
**ATTN: STEVE!!!!** I fibbed when i told you where the bulb holder on the drivers side is. That plug is for something else!.
That's the bulb holder there. You'll need to cut the foam away carefully.
Once it's free of it's sticky foam captor plug the bulb into it.
The bulb holder goes in that hole there. Just push it in and twist it gently.
Put the kick panel back in and you'll have footwell lamps.