It feels like grabbing tickets on Klook isn't too difficult. Even 10 minutes after the release time, I noticed premium tickets were still available. However, I read online that unless you're a hardcore Ghibli fan, just buying a weekday ticket is enough. I bought a Friday weekday ticket. The park opens at 10:00 AM, and I arrived around 10:45 AM, yet I still couldn't finish seeing everything. I completely ran out of time to visit the Valley of Witches, so I'm really glad I didn't get the premium ticket; otherwise, I would have had to rush through everything because every single design is so lifelike, beautiful, and dreamlike. In the Valley of Witches, I also bought a ticket on-site to tour one of the houses. Please note that photography is not allowed inside, but the interior is stunning and well worth a visit. I'm usually not someone who is obsessed with taking photos for social media. Even though they say the Valley of Witches isn't huge, by the time I finished lunch, it was already 2:00 PM. I checked the official website and saw that if your scheduled entry time for the Grand Warehouse is 2:00 PM, you just need to enter by 3:00 PM. My personal advice is that entering around 2:30 PM is just right. If you go right at 2:00 PM, there is a long line. If you stroll over by 2:30 PM, there is no line at all, and visitors have already started dispersing to various parts of the warehouse.
Inside the Grand Warehouse, there is a red central exhibition hall where people queue up to take photos of the Spirited Away train scene. My personal advice is to line up for this last, as the crowds will be much smaller. Also, if you enter at 4:00 PM, you basically don't have to wait in line at all to take photos of all the sets across these two levels. Therefore, I suggest taking photos in other areas first after entering the Grand Warehouse and saving this red exhibition hall for last.
Lastly, I just want to say that, considering this as a theme park, closing at 5:00 PM is way too early!