Place the rod inside the tapestry rod pocket and affix the finials to each end with a screwdriver. Lay the tapestry flat on the floor. Measure the length of the rod, from where the finial and tapestry meet to the other side where they meet.
Measure the ceiling space where you wish to hang the tapestry. Determine how far the tapestry should hang from the wall. Locate the ceiling joists with the stud finder and adjust the measurements as necessary. Place two small pencil marks on the ceiling that match the tapestry rod measurements and align with the ceiling joists.
Drill pilot holes where you marked the measurements and insert the drywall anchors. Screw in the ceiling hooks.
Ask a helper to hold the tape measure on the ground while, on the ladder, you measure up to the shortest ceiling hook. Decide how high you want the tapestry rod to hang. Record that measurement as well as the total height of the ceiling. Move to the higher ceiling hook and repeat. Note the ideal hanging height and record the total ceiling measurement. For example, the lower ceiling measurement might be 8 feet total and you want the height of the tapestry bar at 7 feet. The difference would be 1 foot.
Cut the decorative chain with snips to equal the difference between the ceiling height and the desired height. You will have chains that are two different lengths -- one for the shorter ceiling hook and one for the higher ceiling hook.
Attach the decorative chain to the tapestry rod where the finial and the tapestry meet. Use small S-hooks to fasten the chain around the rod. Hook each end of the chain to the appropriate ceiling hook. Step back to evaluate the hanging tapestry. If the tapestry bar is not completely level, take it down and trim the decorative chain accordingly using metal snips.