In this video

Position the main mounting arm assembly against the pre-drilled holes in the wall. The presenter suggests holding the heavy mount on a shoulder, but a second person or a temporary support would be highly beneficial. Insert the lag bolts into the pre-drilled holes through the mount. Partially drive the bolts using the power drill. Once all bolts are partially in, verify that the mount is level using the built-in level on the mount itself. Once leveled, fully tighten all lag bolts using a socket wrench to ensure the mount is extremely secure to the wall studs. This model's heavy-duty design requires robust fastening.