I was in DLP last July last year the first week of school holidays. It was very busy, as you can imagine. But the early entry and the first hour of operations were very good. I didn't buy Premier access and I was able to do with minimal waits many headliners during early entry. It's very important to be at the park gates 30-40 minutes before official park open for early entry. This way you can be among the firsts to line up for Peter Pan at the Main park, then Big Thunder Mountains. This way you've done two attractions that might easily have 3 hours wait combined later on. After BTM, you have several options, lines should be short almost everywhere, so go with what is most important for you. People take their time to arrive, until 11 lines won't be terrible outside of the headliners.
At the studios there are fewer attractions, so lines spike much more quickly. I would budget for a Premium pass for Crush, if that is of interest. This way at opening you can easily do Web, Tower of Terror, Avengers Assembly, Ratatouille, in this order. The other rides are all average to mediocre, I would prioritize the shows at this point.