1. Installation hardware is included in this kit. No holes are predrilled as customers can customize placement on bottom of bumper to extend as far as they wish although it is made to sit flush with rear of bumper.
2. Removing front bumper may not be necessary, but it is advised to make the job easier, removal of from bumper can be done it roughly (20 minutes) and will help with the quality and placement of the finished product. See instructions on bumper removal here. http://www.g8board.com/forums/showthread.php?t=19042
3. Does require installation of nuts/bolts in rear of bumper (as there is no place there on the stock bumper to mount to. May require some installation of some nuts and bolts to help with rigidity, this will depend on how you mount it. (Personally i installed a couple just to make sure, and because there were some extra in the bag I bought)
4. May require 2 spacers for center (between bumper and lip) where the stock bumper cuts in and upward. You may not wish to do this, but it is an option, depends on how you want the finished product to look. (I used 1/2″ Black PVC tubing cut to size, works perfect.
5. I would rate the difficulty of this project a 2 (from 1-5) as it is pretty straight forward.