We rented in november from national.
You can go straight to the car.
Along the way when your in the garage. Ask the attendant where the car seats are. There was a stack of them when we went. The different sizes for different kids. So, you just grabbed one in the stack. They were in plastic so somewhat hygienic (i'm guessing they are cleaned between use), the one we grabbed was clean.
Then you have to install the thing yourself.
Then off your go like normal.