First, remove the headlight and front cowl from the bike. Remove the 4 screws holding the headlight assembly to the cowl.
Get 2 or 3 flat blade screwdrivers, and preheat your oven to 235f. Once heated, put the headlight assembly on either wood or cardboard, and put it in the oven for 10min. Once the time is up, remove the assembly with oven mitts. Pry between the edge where the front pushes on (sorry forgot to grab a pic) and pry the lens off.
This is what you will have (mine is taped off for painting)
If you wish to paint yours, I recommend Krylon Fusion
Shave/cut the 2 lower tabs of the locator ring off, just as if it was a normal bulb going in
This is where it gets tricky. You have to shave/cut about 2mm from this, as the lock nut for the projector will have no room to grip otherwise. (remove the brass bracket on the left)
Then drill a hole to run your solenoid wire through, close to the hole the projector went through. After that, install the projectors.
Since I used huge shrouds and square projectors I had to do a bit more cutting
Get some Butyl glue, stretch it out a bit, and push it into the space between the lens and other half of the headlight. When done all of the above, place the lens on top of the lower half, lining it up the best you can
Put it back in the oven at 235f for 10min, and use pliers to push the 2 halves together. Let it cool, mount up your ballasts (side of the headlight housing works well) then reinstall to the front cowl, run the wiring and your done!