The 2.2 liter engine uses colored links on the timing chain to align with the marks on the gears. You just have to rotate the engine to where the copper chain link is up on the upper right side of the intake can gear--aligned to the INT diamond on the gear. Then the silver link should be down at about 5 O-Clock on the crankshaft timing mark. The other silver link should then be aligned to the mark on the exhaust cam sprocket. See picture below.
For the 3.0 liter engine, there are marks on the belt that line up with marks on the gears. The book calls out special tools to hold the cam sprockets in alignment while the belt is put on. There is also a special tool to lock the belt onto the crankshaft sprocket. See pictures below.
Please let me know if you have questions.
camshaft sprocket alignment with belt marks
Camshaft locking tools
Crankshaft belt tool
Properly adjusted tensioner