To Remove:

Disconnect the negative battery cable.
Remove the engine undercover, if equipped.
Disconnect the wiring from the alternator. If necessary, mark the wires with tape or other means to ensure they are connected properly upon installation.
Loosen the belt tension, and remove the drive belt from the alternator.
Remove the alternator adjustment bolt, followed by the pivot bolts.
Carefully lift the alternator from the bracket.

To install:

Hold the alternator in position on the mounting bracket, and install the pivot bolt. On later engines with automatic belt tensioners, install the upper mounting bolt.
Install (but do not tighten) the alternator adjustment bolt (earlier models only).
Place the alternator drive belt on the pulley.
Adjust belt tension and tighten the mounting and adjustment bolts to 18 ft. lbs. (25 Nm).
Connect the wiring to the alternator. If tape was used to identify the wires, make sure it is removed once the wires are connected.
Install the engine undercover, if equipped.
Connect the negative battery cable.

What engine? 1.8LT, 1.9L TDi, 2.0L or VR6?

I have better directions once I know what engine you are dealing with.

Thomas