Sengh IIRC you have an earth (brown), a live (yellow black) and a heater (white/green)
You need to drill out the rivets for the manual adjuster brackets and bin them.
3 phillips head screws behind the door cover for the mirror. Fit leccy mirrors in, feed the wiring through and thats the hardest bit done.
Find any ignition live at the back of the fuse box. I think I tapped into a spare plug laying around but if you don't have a multi meter I wouldn't chance it.
Earth goes on the earth plate near pedals,
Location: P/02 Rear Window Defogger Switch, - Yellow Black wire
Location: P/03 Rear Window Defogger Switch - White/ green wire
http://www.a2resource.com/electrical/CE2.html