This video provides tips on removing the spark plug coil packs on a 2010 Dodge Nitro 3.7L vehicle. Since the 2010 Jeep Liberty is essentially the same vehicle it may be useful for that one as well. Amazon links to parts below if interested. These are the exact parts I purchased and they arrived in just a couple days with Prime.

Amazon link to coil pack (set of 3):
https://www.amazon.com/gp/product/B01...

Amazon link to spark plug wires:
https://www.amazon.com/gp/product/B01...

Amazon link to spark plugs:
https://amzn.to/2C9pXqY