An apparatus and method for installing a post particularly for use with vinyl fencing. The apparatus includes a mounting fitting having a first member defining a web and an aperture and a second member defining a peripheral surface. The aperture formed by the first member is disposable about a stake such that the first member is engageable with the outer surface of the stake to frictionally support the mounting fitting thereon. The peripheral surface of the second member is connected to the first member by the web and is engageable with the inner surface of a hollow post to frictionally support the post about the stake. The related method for installing a post includes the steps of securing a mounting stake to a surface, frictionally coupling a mounting fitting to the stake, and sliding a hollow post about the stake and mounting fittings such that the mounting fitting frictionally supports the hollow post about the stake.