Front panel was broken during a rapid decelaration event during a test of some principal about two objects not being able to occupy the same point in space. IE; the phone and a concrete floor.
Coming apart, rather easy. Using a hair dryer to pry apart the plastic frame from the broken glass took a LONG time to get soft enough to pry apart. As stated in the iFixit guide, patients.
There is a thin rubber gasket that surrounds the plastic frame, don't peel it off, thinking it borders the glass. You'll end up with a no water tight seal around the glass once the repair is complete. Also, it's fragile and easy to start peeling off.
Oh, and buy a case.