In this video I will show you how to replace your Droid Razr XT912 headset jack. You can also follow this tutorial to learn how to replace your battery, earpiece, and both front and rear facing cameras.
There is a lot of adhesive between the rear panel and the battery. Failure to remove the back panel properly often results in damage to the battery. Replacement batteries are usually limited in supply so you will want to be very careful when taking this phone apart.