You'll go to baggage claim level and proceed outside to the island. Look above for the islands labeled as shuttles (purple IIRC) and take the 5 min ride to Hz.

When you exit with your car, turn right out of the lot and then left at the 1st light. Turn left again at the light at Century Blvd. I-405 is a ways up on your right. Heading N, you'll take the on-ramp after you pass under 405.

LMK if you need further notes ...

GMF