Yup... it's the first thing I've ever done to my liberty.
Basically you need to
1.) remove the drivers seat,~ 5 bolts.
2.) remove bezel around the stereo ~ 1-screw
3.) remove stereo 4 philips screws
4.) Plug in the supplied subwoofer harness into the deck. (no splicing, all plug and play)
5.) run the subwoofer cable under the center console, you can either remove the center console or simply shove the wire along side it(that's how I first did it)
6.) plug wire into sub
7.) Place seat over sub and screw it all back down, replace factory radio and bezel.
It's a pretty simple install, I no longer have the sub anymore, because I have a different sound system... mainly because there are amps where the mopar sub once was.
Bennett