I can attest to this. This was a BIG factor on how I was able to successfully book an early group multiple times (group 30 and below). Just don't mind selecting group members. I just select myself and then just approach the guest services team to add everyone in your group after.5. Hit the remaining Join/Confirm buttons on the next two pages as fast as possible without hesitating or even reading. I think this was the key tip that helped me. Just click, click, click. The cast member said not to worry about selecting group members or making sure they are correct. If someone was missed, they will be able to help you add them afterward.