Is it easy to sneak down to better seats at United Center? Which gates/entrances don't have ushers?

I am going to the game 5 (Bulls vs. Pacers) at the United Center and I bought standing room tickets! I was wondering if it's easy to sneak in anywhere? I'm not looking to sit down, even just standing somewhere with a better view works! Is there a certain entrance where there aren't really ushers standing checking your tickets? I went to a game two weeks ago and I was a good hour late and we actually walked into the wrong entrance and stood there for quite some time and it was perfectly fine. So would you recommend doing it some time into the game? Also, where is the best place to stand to get autographs before the game? Is it really hard to get them?