Like others have said, its an easy bolt on. There is no drilling required. Everything included in the box was needed to install properly. The spacers included set everything up nice and level. I set mine up on the 4runner piece by piece, but you can also loosely bolt everything together and then lift it on the vehicle. Took me a couple hours to put it all together.

Only thing you'll need are some tools, silicone and some rags to clean up the roof when you take off the old rack.

You can check out my insta (@shadow4runner), i took a couple photos during the install. A lot of guys who answered here helped when i asked as well.