My iphone 6 loudspeaker wasn't nearly as loud as it used to be.
No problem, very easy, however, it took a full 5 minutes getting the antenna connector to snap back in place.
I skipped all the steps of removing the display, just propped up the display perpendicular against a stack of books. The display stood relatively solid with little chance of cable stress. Removing the display takes several steps, not removing it makes the repair much simpler.