I intend to watch Steelers @ Texans on Oct 1st, please help me out!

As the tittle says, I want to watch Steelers @ Texans on Oct 1st.

I just moved from Brazil and as a longtime Steelers supporter this is a once in a lifetime chance for me since I am not sure I will have another shot to watch Steelers live.

I have a few questions that hopefully you guys can answer for me:

– is it fine to support the visitor team? can I wear a jersey without beeing harassed?
– do I have to buy ticket for any specific sector if I support the visitor?
– is the NRG Stadium parking is a must or there are other parking lots near it?

Help me on making this possible, please!!