Is it enough to just hit the 6 pm show, if that's all I have time to do??

Yes you need reservations. If you just go and hope to get in , they said some people are there at 3 waiting in line in Hope's to get in. No guarantee

So are reservations for both shows or just reserve for one. I'm needing to leave by 10, so figured bailing before the 930 makes the most sense..

Yes! Its a full show!

There are about 10-12 first come first served seats that dont require reservation, but youll likely have to get there early and wait in line before doors open.

Yes but you need reservations