How do I replace the alternator on lexus es 300

Look first in the internet from suggestions in google. If nothing helpful take it to the good toyota mechanic or dealer.

You must first loosen the alternator belt. There are 2 12mm bolts that must be loosened first and then a 14 mm to rotate the alternator down to get the belt off. Then remove the 14mm bolt and the 12mm on the slack adjuster and after disconnecting the negative battery terminal, remove the connector and wiring from the alternator and remove it from the car.

Need to know how to get bolt from bottom

What to do after replacing alternator