Easy
They are easy to put on, added mine in about one hour after getting up on the lift. Be warned, if you are expecting heavy duty, they are not.
Added skids to my 2003, the 2014 front is lighter materal and has a lot of service holes. Will be making my own eventually.
The transfer case skid will keep you from hitting the case with a projectile but will not support any weight. Likely build this one also.
Finally, the gas tank Skid is ABS plastic (I think it's ABS not sure, but it is plastic). Again you will not be draging it much. Don't know what to do to cover that anchor.
I guess the Expeditions not my Wrangler, a lot more comfortable and better gas mileage.