Disconnect the negative battery terminal with a wrench.
Pull up on the belt and remove it from the alternator.
Remove the two electrical connectors from the alternator. One is held on with a nut that you can remove with a ratchet; the other is an electrical connector that requires you to press down on a tab and pull the connector straight out.
Remove with a ratchet the two long alternator bolts that secure the alternator and thread into the engine block. Remove the alternator from the engine.
Install the new alternator onto the engine and thread in the bolts. Tighten the bolts with a ratchet.