Can someone who has done the install themselves give me some hints?
there seem to be quite alot of drilling and I dun want to mess the stock
rear bumper up lol.. unless if the install is going to be done correctly

It's easiest if you have someone help you and if you remove the rear bumper. We set the bumper on a couple of saw horses for the work and everything went smoothly. I also didn't need to drill the huge "hole saw" holes that it said were needed. They may be necessary for tolerances if you don't remove the bumper?? The 2nd set of pilot holes were about right but I can't remember what size it was.

Thanks for the tip bro, how hard is it to remove the rear bumper?
I went thru the service menu, and it seems like removing the rear bumper is quite a bit of work

I did mine while still on the car. It took me a little over an hour. A skew (right angle) drill adapter helps a lot. If you have specific questions let me know.