I have a series of photos on Flickr that shows a bit more detail back when I did mine in 2010. Hopefully you can see the whole set from this one link:
(click on the left arrow to go in the right direction)
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It wasn't difficult, just nerve-wracking as I had no garage at the time and worked outside in my driveway.
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Cheers!
Steve/ Terran Sin?
Terran Sin