Using a clutch-alignment tool is necessary to centre the clutch disc perfectly under the pressure plate, which gets bolted to the flywheel. Without the use of the tool it will be extremely difficult to align the splines in the clutch disc with the pilot-bearing hole in the flywheel. Generally, a pilot tool made of nylon will accompany a clutch kit. In the absence of such a tool, a universal clutch alignment tool is available at auto parts stores.
Hold the clutch disc with the centre springs facing outward, away from the flywheel. Notice the bevel is on one side of the centre of the disc. It is important to make this distinction so the right side of the clutch is facing the flywheel.
Insert the clutch alignment tool through the spring side of the clutch disc.
Hold the disc spring-side-out against the flywheel and insert the clutch alignment tool into the pilot bearing hole in the flywheel. While holding the clutch alignment tool in the pilot hole, push the clutch disc toward the flywheel so it is flush.
Take your hand off the clutch alignment tool and pick up the pressure plate and lay the securing bolts within reach. The disc is heavy and tiring to hold, so making the bolts easy to reach is a good move. The flywheel has two alignment studs that will fit through two corresponding holes in the outer flange of the pressure plate. Center the pressure plate on the flywheel and slowly rotate it until the flywheel studs enter the alignment holes in the pressure plate flange.
Install the bolts in the pressure plate loosely. Grab the alignment tool and push it home again. Tighten the securing bolts in the pressure plate using a socket. Tighten the bolts in an "X" pattern. Withdraw the alignment tool.