All holes that you will be required to drill are already marked, I had less than a day from my track day to install this whole set and drilled almost everything at once when it was off the bike, then just threw it all on and it fit perfectly. Extremely satisfied in that department. Quality of the pieces isn’t the best for what I think you should get when dropping $500+ dollars but hopefully they make up for it in durability.
Note: my kit didn’t come with a tail light cover so I ended up just painted my stock one black, taking the bulb out and clipping it in there, I was under the impression it would come with one though. Just keep that in mind