Easiest way to swap housings (w580i,s500)

Hey! I was wondering. What would be the easiest way to swap the housing of my w580i to that of the s500? I've just recently ordered the new housing(s500), and was thinking of a way to pull off a swap without screwing up my phone:rolleyes:

I have looked over the w580/s500 manual online, and its a tad bit unhelpful to me.
I am not completely incompetent,I have opened up my phone on a few occassions, (I had to replace the screen once as well) and everything turned out OK. Its just that for this procedure there are a whole lot of minor details that can't be overlooked, and i don't want to go wrong!

Any vids, tutorials, etc. out there?

Thanx

Capt.Fab