MauiBuilt: very simple no cutting, no drilling, and no removal of stock parts (you simply swap out bolts).
I purchased the M5 (aka 5mm) x 55 mm bolts at Home Depot on the hardware aisle. You remove the stock bar end cap bolts (I believe 5mm hex). Keep the stock end cap on there. It looks fine but main reason is to keep the guards from hitting the rubber of the throttle grip (dangerous!). Thread new bolt through a M6 washer (also easily found at Home Depot or Lowes) then through the Acerbis guard then thread it through the end cap and tighten bolt until you have just enough play to adjust/level the handguards as desired. Tighten securely once satisfied. I may add some Threadlock if I notice any play due to vibrations down the line.
They are amazing! Although I cannot attest to protecting from the cold (thanks to a pleasantly warm weekend), they did a nice job of breaking the wind. They did such a great job that cruising on a road where 60+ was a windy burden, it became hard not to surpass 85. Tested casually up to 118 and no issues with the guards becoming loose or anything. I love them! The amount of improvement convinced me to buy the flyscreen on Monday - if the handguards helped this much I can only imagine the improvements from the screen.
I'll post photos up tomorrow. I took them but they are on my camera still.
UPDATE - Photos:
Note: I adjusted the leveling of these after the ride, so they now are tilted up a little higher to better deflect wind. I also just test-mounted the Triumph paint-matched flyscreen - it makes the front look much cleaner with these guards.
I'll post up once I do my writeup with more detailed photos on my personal site.