Now getting to the good part - fitting the sill!!!
First off, make sure that the wires are all in the correct places, and when happy - TAPE THEM UP. I didn't do this and now have a rattle

(Still not sorted 1 year on!!!
Then re-fit the seat belt retractor on the left hand side of the car. This can be really fiddly as we had a struggle getting the screw holes to match up, and then actually having enough room to tighten them is a pain as well.
Once that is back in place, replace the interior carpets (inside the car - not the boot) back in place. Remembering to screw the mushrooms caps back in place.
Once the carpets and rubber edging is back in place you can fit the sills.
I found that there was more than enough wire so ended up tapping part of it to the underside of the sill. Just make sure that the wire is not in the way of any of the clips!!!
Fit the sill by pushing it over the lip on the door step on the outside of the door, and then pushing it down into place - making sure you connect with all the clips!!!
Your interior should now look like it has never been touched!!!
Finally go back to the boot (and ensuring the engine is off!!) fit the door sill connector and fuse into the fuse box. My sills didn't come with the correct fuse but underneath the spare tyre you will find spares of all the fuses so just used their's - still need to replace it though ...
Once the fuse is fitted, check that the sills work (obviously this can be done earlier!!!)
You can then replace the carpet back in the boot - screwing it back in place, with the 2 or 4 screws. Replace the carpet over the spare tyre, and finally re-fit the boot cover. Again second pair of hands helps here, as one can hold the cover whilst the other lines it up with the struts and then pushes the pins back in. Push the pin in, and then push the centre part of the pin back in place.
Hopefully your car is now back as it was, you have no nuts or bolts left over, and you have working sills!!!
And would you believe it, I actually don't have any photos of my sills!!!!!
So can't even show you the finished item!!!
Hopefully that should give everyone a better idea on what to do - let me know if anyone needs anymore info, and hope it all goes smoothly!!!