First Time at the Egyptian Theater

I've got tickets for a showing tonight at 7pm for Children of Men at the Egyptian Theater, and I had a few questions since I've never been before. The showing is sold out, so how soon should I arrive to get good seats? Also, will the film start exactly at 7, or a bit later? A lot of other posts have already mentioned parking, so I think I've got that sorted out. How's the seating situation? Is it cramped or does it have decent leg room? Will I be able to see the entire screen, or will someone's head in front of me be blocking some of the bottom (I'm just under 6 ft tall)? Anything else I should know? Thanks in advance