Use the tip of a spudger or your fingernail to flip up the home button ribbon cable retaining flap.

Be sure you are prying up on the retaining flap, not the socket itself. The retaining flap is the small flap on the charging port side of the cable retainer. It should flip up 90º.

Use a pair of tweezers to gently pull the home button ribbon cable out of its socket. Note its position for reinsertion.

Do not excessively strain the home button ribbon cable as you remove it, as it is very thin and fragile.