As darrsi says. The link above tells it all but is quite lengthy so to summerize :-
The expensive parts will be fairing, headlight unit, fairing mounting sub-frame. This will be the hardest and most painful part on the purse!
Making a few small steel brackets. I.e. Cutting, drilling and bending 1.5 to 2 mm steel strip.
Some basic but careful new wiring with a couple of relays.
If you are handy with that sort of thing it's not difficult and quite satisfying, also you end up with much better lights.
As always just ask on here if you need more info.