I think that only depends on how far back you are in the line at CBR. If we were staying at Pop or AOA, I would have taken an Uber to DHS around 8:30ish. By then, the parking lot should be opening and you don't have to hassle with parking.
Last week when we were there on one of our Studio days we drove and they were not letting people into the parking lot till 9:00 am. We were all held at the booth where you pay to park.