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Set the tank seal in place.
Place the tank on the bowl.
Drop the tank bolts through the appropriate holes.
Tighten the bolts until the tank doesn't wobble. Be sure not to over tighten the bolts: you could crack the porcelain. If you're working alone, attach the bowl to the floor before installing the tank.
Slowly set the tank and bowl assembly onto the wax seal, lining up the bolts with the mounting holes in the bowl.
Tighten the nuts onto the bowl until the assembly doesn't wobble.
Reconnect the toilet supply tube to the tank.
Refill the tank, adjust the water level, and check for leaks.
Attach the seat using the seat bolts provided.