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While measuring piston position with a scale through the spark plug hole, rotate the crankshaft until the piston is precisely at TDC and note this distance. (There are special timing gauges for this purpose with lock screws to hold the setting but a little ruler will work just fine.)
Now, turn the crankshaft in the opposite direction from normal rotation (usually counterclockwise as viewed from the flywheel end) until the piston moves down .25 inches or so and then turn it slowly in the normal direction of rotation until the piston position is precisely at the timing dimension listed in your engine specifications.
The flywheel should be temporarily re-installed without tightening the nut.
Rotate the crankshaft until the timing marks are precisely aligned.
Carefully remove the flywheel without disturbing the crankshaft position.