Yes, I found it impossible simply because you have the people at their 60 day time scheduling a couple days before you get to schedule. I would immediately try to secure the FPs for FOP & Toy Story land on the 4th day of your trip and beyond if you want to secure them -when you go on the site to reserve don’t even consider the first three days of your trip - you can easily come back a few minutes later and get FPs for other top attractions. I learned this first hand trying to schedule my trip initially using the crowd calendar - I had to change everything because I could not reserve FPs for FOP on the first 3 days of my trip and had to re-schedule some dinner reservations and switch days at the park, but it can be done easily. Good luck and we look forward to hearing how you made out.