A headrest assembly (36) for a vehicle seat (10) and a method of installation. The headrest assembly (36) includes a support post (28) pivotally connected to an installation post (16) via an installation hinge (30). The installation post (16) is installed into a guide sleeve (14) of the seat back (12) such that the installation hinge (30) is still exposed, allowing the headrest body (34) to tip down and forward. The seat (10) is then installed into the vehicle body (50), after which, the headrest body (34) is tipped up and pushed down until a support post notch (38) engages with an installation catch (20) mounted on the guide sleeve (14). The headrest (36) will now remain in its use position with the hinge (30) contained within the guide sleeve (14).